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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Lenses (3):
Recent article
Lenses
Abstract
The advent of digital photography allows the practitioner to show the patient the photographs immediately, to co-diagnose, and to work with the patient chairside or in a consult room while showing the patient some simple imaging techniques, such as whitening the teeth, making the teeth look longer, a...
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PMID: 21473989
PDF is available here.
PDF is available here.
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Dental update (37)9 2010
Abstract
There are three principal reasons for adopting magnifying loupes for operative dentistry: to enhance visualization of fine detail, to compensate for the loss of near vision (presbyopia) and to ensure maintenance of correct posture. The wearing of loupes is becoming an accepted norm amongst qualified...
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PMID: 21179934
PDF is available here.
PDF is available here.
Applied Optics (49)28 2010
Abstract
We found close agreement between test results obtained from a ZEMAX model of the test bed and test lens and those obtained by experiment (maximum error of 12 μm for the singlet lens and 5 μm for the achromatic triplet lens). Future applications of the hyperspectral Shack-Hartmann test include meas...
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PMID: 20885478
PDF is available here.
PDF is available here.
Applied Optics (49)28 2010
Abstract
We developed a method for immobilization of biomolecules onto thiol functionalized surfaces according to UV diffraction patterns. UV light-assisted molecular immobilization proceeds through the formation of free, reactive thiol groups that can bind covalently to thiol reactive surfaces. We demonstra...
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PMID: 20885470
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We apply mutation operators to control damping factor in Damped Least Squares. We study the mutation behavior in this method when the algorithm confronts with local minima. The proposed method can go beyond local minima by taking mutation operators to control damping factor. The proposed method was...
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PMID: 20940982
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We propose a hologram design process which aims at reducing aberrations in parallel three-dimensional direct laser writing applications. One principle of the approach is to minimise the diffractive power of holograms while retaining the degree of parallelisation. This reduces focal distortion caused...
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PMID: 20941005
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We apply the transformation optical technique to modify or improve conventional refractive and gradient index optical imaging devices. In particular, when it is known that a detector will terminate the paths of rays over some surface, more freedom is available in the transformation approach, since t...
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PMID: 20941020
PDF is available here.
PDF is available here.
Lab On a Chip (10)18 2010
Abstract
We report a two-dimensional (2D) tunable liquid gradient refractive index (L-GRIN) lens for variable focusing of light in the out-of-plane direction. This lens focuses a light beam through a liquid medium with a 2D hyperbolic secant (HS) refractive index gradient. The refractive index gradient is es...
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PMID: 20697662
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
A pixel partition scheme assisted with patterned or center-hollowed microlens-array films (MAFs) was proposed to improve the optical characteristics and electrical properties of organic light-emitting diodes (OLEDs). In our optical simulation results, a pixel of 1 × 1 mm(2) with a center-hollowed M...
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PMID: 20940760
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We present a new method to make liquid lenses. It is based on the microfluidics method and involves the preparation of emulsions one drop at a time. Tests of lenses by image formation are presented. Experimental results are compared with results of an optical design program. We also present a new ty...
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PMID: 20940763
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We propose a four-leaf-clover-shaped antenna structure composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were first investigated on a half-infinite substrate as a simplified radiation environment to reduce the comput...
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PMID: 20940745
PDF is available here.
PDF is available here.
Optics Letters (35)16 2010
Abstract
We report the development of a miniaturized dual-optical-zone endoscope objective lens. The lens has two foci, with 0.18 and 0.50 NAs. We demonstrate multiphoton imaging with dual fields of view and resolutions using the new lens. A combination of multiphoton and single-photon microscopic imaging is...
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PMID: 20717440
PDF is available here.
PDF is available here.
Abstract
Journal of Endodontics (36)8 2010
Abstract
Within the limitations of this study, more accessory canals were detected and negotiated when using the microscope compared with loupes. This improvement was more pronounced in second molars than in first molars. All negotiated accessory canals merged with either one of the main mesial canals.
Copyr...
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PMID: 20647082
PDF is available here.
PDF is available here.
Optics Express (18)16 2010
Abstract
We present a direct slope-based correction algorithm to simultaneously control two deformable mirrors (DMs) in a woofer-tweeter adaptive optics system. A global response matrix was derived from the response matrices of each deformable mirror and the voltages for both deformable mirrors were calculat...
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PMID: 20721058
PDF is available here.
PDF is available here.
Lab On a Chip (10)14 2010
Abstract
We demonstrate lensfree digital microscopy on a cellphone. This compact and light-weight holographic microscope installed on a cellphone does not utilize any lenses, lasers or other bulky optical components and it may offer a cost-effective tool for telemedicine applications to address various global...
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PMID: 20445943
PDF is available here.
PDF is available here.
Journal of Endodontics (36)7 2010
Abstract
The use of magnification to enhance fine motor skills was supported in all age groups and experience levels.
Published by Elsevier Inc....
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PMID: 20630285
PDF is available here.
PDF is available here.
Applied Optics (49)19 2010
Abstract
A 980 nm bottom-emitting vertical-cavity surface-emitting laser (VCSEL) with a p-contact diameter is reported to achieve high power and good beam quality. A numerical simulation is conducted on the current spreading in a VCSEL with oxidation between the active region and the p-type distributed Bragg...
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PMID: 20648149
PDF is available here.
PDF is available here.
Applied Optics (49)19 2010
Abstract
An off-axis optical system with an x-y polynomial surface for a see-through head-mounted display (HMD) is presented. With the use of an x-y polynomial surface, an off-axis see-through HMD system with one tilted spherical combiner and six relay optical lenses is designed. An off-axis see-through HMD...
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PMID: 20648131
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
Digital speckle photography is a useful tool for measuring the motion of optically rough surfaces from the speckle shift that takes place at the recording plane. A simple correlation based digital speckle photographic system has been proposed that implements two simultaneous optical extended fractio...
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PMID: 20589000
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We adapt tools of transformation optics to surface plasmon polaritons (SPPs) propagating at the interface between two anisotropic media of opposite permittivity sign. We identify the role played by entries of anisotropic heterogeneous tensors of permittivity and permeability--deduced from a coordina...
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PMID: 20589064
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We propose a new method for rectifying a geometrical distortion in the elemental image set and extracting an accurate lens lattice lines by projective image transformation. The information of distortion in the acquired elemental image set is found by Hough transform algorithm. With this initial info...
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PMID: 20589062
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We developed a multimodal adaptive optics (AO) retinal imager which is the first to combine high performance AO-corrected scanning laser ophthalmoscopy (SLO) and swept source Fourier domain optical coherence tomography (SSOCT) imaging modes in a single compact clinical prototype platform. Such syste...
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PMID: 20589021
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We demonstrate a liquid droplet whose surface profile can be reshaped by voltage. As the dielectric force increases, the dome of a liquid droplet could touch the top substrate and become flat. While the voltage is removed, the droplet recovers to its original spherical shape. By choosing proper liqu...
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PMID: 20589052
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We propose an automatic performance balancing method. An automatic outer loop is added in the optimization process. The weight for each sampled field and azimuth is calculated appropriately according to the actual performance of the current design and the system requirements, and it is applied to th...
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PMID: 20589018
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We present Finite Element Method simulations and experiments investigating light passing through arrays of nanometric spatially varying near-resonant slits perforated in a silver film. We demonstrate that a one-dimensional focusing element can be obtained by tailoring the phase across the device thr...
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PMID: 20589027
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
This paper presents a method for the efficient production of all-fiber semi reflective mirrors suitable for fiber sensors and other all-fiber device applications. The mirrors are obtained by the short duration etching of a standard single mode fiber in hydrofluoric acid, followed by an on-line feedb...
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PMID: 20589063
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
A simple technique to incorporate microlenes with small photodiode arrays is demonstrated and analyzed. Using this method, the fill factor was increased from 2.6% to 22.4% for a two by two array. Simulation results are also shown. The photocurrent with microlens was approximately 8.6 times larger th...
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PMID: 20589031
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We present an optical system capable of generating stereoscopic images to track trapped particles in three dimensions. Two-dimensional particle tracking on each image yields three dimensional position information. Our approach allows the use of a high numerical aperture (NA=1.3) objective and large...
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PMID: 20589039
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We propose an approach for far-field optical subwavelength imaging by using a dielectric metamaterial magnifier with gradient refractive index. Different from previous superlens and hyperlens that form a real image with subwavelength features within narrowband, this magnifier creates a virtual color...
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PMID: 20588981
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefront disturbs the overall performance of the reflectarray...
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PMID: 20588948
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We demonstrate lensfree holographic microscopy on a chip to achieve approximately 0.6 microm spatial resolution corresponding to a numerical aperture of approximately 0.5 over a large field-of-view of approximately 24 mm2. By using partially coherent illumination from a large aperture (approximately...
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PMID: 20588977
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We propose a thin autofocus system using a large stroke MEMS (micro-electro-mechanical systems) deformable mirror which has the potential to downscale the size and to minimize chromatic aberration. The large stroke MEMS deformable mirror is made by a polyimide membrane that has a maximum 12 microm d...
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PMID: 20588967
PDF is available here.
PDF is available here.
Lab On a Chip (10)9 2010
Abstract
We demonstrate color and monochrome on-chip imaging of Caenorhabditis elegans samples over a wide field-of-view using incoherent lensless in-line holography. Digital reconstruction of the recorded lensless holograms rapidly creates the C. elegans images within 24 mm2. By digitally combining the recon...
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PMID: 20390127
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
Distributed aperture synthesis is an exciting technique for recovering high-resolution images from an array of small telescopes. Such a system requires optical field values measured at individual apertures to be phased together so that a single, high-resolution image can be synthesized. This paper d...
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PMID: 20588888
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
An all-optical wavelength multicasting scheme using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF) Sagnac loop mirror has been demonstrated. This proposed scheme has the advantage that even when the wavelength of a multicast channel overlaps with the pump-pump generated idler, clear eye d...
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PMID: 20588889
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We proposed a quantitative theory based on the surface plasmon polariton (SPP) coupled-mode model for SPP-Bragg reflectors composed of N periodic defects of any geometry and any refractive index profile. A SPP coupled-mode model and its recursive form were developed and shown to be equivalent. The S...
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PMID: 20588902
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
Laser emission from leaky waveguides based in dye-doped organic gain media incorporating Polyhedral Oligomeric Silsesquioxanes (POSS) nanoparticles is reported. The samples consist of thin film gain media deposited onto glass substrate defining a planar asymmetric slab waveguide, which does not inco...
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PMID: 20588878
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Tunable liquid-filled lens integrated with aspherical surface for spherical aberration compensation.
Abstract
A novel liquid-filled lens design is presented. During fabrication, high precision single point diamond turning (SPDT) is introduced into standard soft lithography process to fabricate an aspherical surface constituting one end of lens. This enables the spherical aberration associated with the opera...
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PMID: 20588848
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present thermally reconfigurable multiplexing devices based on silicon microring resonators with low tuning power and low thermal crosstalk. Micro-heaters on top of the rings are employed to tune the resonant wavelengths through the thermo-optic effect of silicon. We achieve a low tuning power of...
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PMID: 20588834
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We have acquired holograms with acquisition times as short as 10 ms, limited by the switching speed of our shutter; frame rates of 100's of Hz are expected to be possible. The samples are imaged with a Yb:KGW femtosecond laser oscillator, whose 1027 nm wavelength is well suited to minimize absorptio...
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PMID: 20588833
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
A new type of confocal microscope is described which makes use of intensity correlations between spatially correlated beams of light. It is shown that this apparatus leads to significantly improved transverse resolution.
(c) 2010 Optical Society of America.
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PMID: 20588827
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present a high bandwidth piezoelectric-actuated mirror for length stabilization of an optical cavity. The actuator displays a transfer function with a flat amplitude response and greater than 135 masculine phase margin up to 200 kHz, allowing a 180 kHz unity gain frequency to be achieved in a clo...
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PMID: 20588824
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We show how geometrical and crystallographic arrangements of an electro-optic sensor plate enable the realization of the real-time visual observation of traveling 100-GHz electromagnetic waves. For this purpose, a generation technique for a 100-GHz optical local oscillator signal at 780 nm was newly...
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PMID: 20588856
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present an analysis that shows how these considerations affect the spatial resolution, and how they create a trade-off between the number of pixels and the frame rate of the STEAM imager. We also quantify how STEAM's optical image amplification feature improves the imaging sensitivity. These anal...
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PMID: 20588855
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We showed that multiple-diffraction with high intensity from the MMA redirected the trap lights to escape from the LED causing the light extraction enhancement.
(c) 2010 Optical Society of America....
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PMID: 20588920
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We demonstrate an elliptically symmetric plasmonic lens that is illuminated by a radially-like polarization field. This illumination function is TM polarized with regard to the plasmonic lens, ensuring optimum coupling of the incident light into surface plasmons polaritons. The structure is analyzed...
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PMID: 20588942
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
A bistable, polarizer-free, and reflective electro-optical switch based on a droplet manipulation on a liquid crystal and polymer composite film (LCPCF) is demonstrated. A color droplet on LCPCF can be manipulated by a wettability gradient owning to the distribution of LC directors anchored among th...
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PMID: 20588864
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present the experimental demonstration of a subaperture compression scheme achieved in the PETAL (PETawatt Aquitaine Laser) facility. We evidence that by dividing the beam into small subapertures fitting the available grating size, the sub-beam can be individually compressed below 1 ps, synchroni...
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PMID: 20588862
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present a method to determine, for the first time, the ratio of forward-propagating second harmonic (SHG) signal to back-propagating SHG signal (F/B) in vivo on the surface of intact tissue samples without any biopsy or tissue sectioning, using only epidetection (i.e., via a single objective lens...
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PMID: 20588906
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
A frameless hologram display module employing a modified resolution redistribution system is proposed in this paper. The frameless display modules can be aligned two-dimensionally to realize a large display screen. The modified resolution redistribution system consists of a one-lens imaging system,...
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PMID: 20588883
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We investigate the focusing properties of a femtosecond vortex light pulse focused by a high numerical aperture objective. By using the Richards-Wolf vectorial diffraction method, the intensity distribution, the velocity variation and the orbital angular momentum near the focus are studied in great...
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PMID: 20588936
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
In this paper the polarization states of linearly and radially polarized plane wave and doughnut beams in the focal volume of high numerical aperture objectives are studied. Through manipulating the incident polarization states of laser beams as well as the apodization of an objective and adjusting...
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PMID: 20588935
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We demonstrate the use of a compressive sampling algorithm for on-chip fluorescent imaging of sparse objects over an ultra-large field-of-view (>8 cm(2)) without the need for any lenses or mechanical scanning. In this lensfree imaging technique, fluorescent samples placed on a chip are excited throu...
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PMID: 20588904
PDF is available here.
PDF is available here.
Optics Express (18)9 2010
Abstract
We demonstrate the proof of concept of this multi-angle lensless imaging platform by using light emitting diodes to characterize various sized microparticles located on a chip with sub-micron axial and lateral localization over approximately 60 mm(2) field of view. Furthermore, we successfully apply...
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PMID: 20588819
PDF is available here.
PDF is available here.
Abstract
As a primary aim, several approaches to photothermal (thermal-lens) and optoacoustic determination of exogenous pyrogens (lipopolysaccharides) based on photometric procedures for their determination at the microgram level and below are compared. The limits of detection of lipopolysaccharides by ther...
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PMID: 20188934
PDF is available here.
PDF is available here.
Journal of Dentistry (38)4 2010
Abstract
Three prospective studies were included, all dealing with endodontic surgery. No significant difference in outcomes was found among patients treated using magnifying loupes, surgical microscope or endoscope. Similarly, no difference was found with or without using the endoscope. No comparative study...
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PMID: 20117164
PDF is available here.
PDF is available here.
Optics Letters (35)7 2010
Abstract
A technique for phase microscopy using a phase diffuser and a reconstruction algorithm is proposed. A magnified specimen wavefront is projected on the diffuser plane that modulates the wavefront into a speckle field. The speckle patterns at axially displaced planes are sampled and used in an iterati...
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PMID: 20364206
PDF is available here.
PDF is available here.
Abstract
I discuss the applications and advantages of using AO in a specific system, the AO scanning laser ophthalmoscope. Since the Borish award was, in part, awarded to me because of this effort, I felt it appropriate to select this as the topic for this article. Furthermore, users of AO scanning laser oph...
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PMID: 20160657
PDF is available here.
PDF is available here.
Abstract
In transnasal small-caliber EGD, oolong tea instead of water as a washing solution for endoscopic lens cleansing is useful to maintain good visibility.
(c) Georg Thieme Verlag KG Stuttgart . New York....
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PMID: 19967631
PDF is available here.
PDF is available here.