Find your PDFs fast.
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.
Optical Devices (3):
Recent article
Optical Devices
Abstract
A novel spring-loaded-crutch design may provide patients additional forward velocity, relative to traditional axillary crutches; however, this idea has not yet been evaluated.
|
PMID: 21576711
PDF is available here.
PDF is available here.
| < More recent | Older article > |
Abstract
The label-free technique of optofluidic intracavity spectroscopy (OFIS) uses light transmitted through a cellular body in a microfluidic optical resonator to distinguish different types of cells by their optical properties. The OFIS technique has differentiated canine hemangiosarcoma...
|
PMID: 20483694
PDF is available here.
PDF is available here.
Abstract
We present new tools that improve targeted imaging of specific organs and tumours, and validate the effects of improved targeting of the pinhole focus.
A SPECT system with 75 pinholes and stationary detectors was used (U-SPECT-II). An XYZ stage automatically translates the animal bed with a specific...
|
PMID: 21063706
PDF is available here.
PDF is available here.
Tsitologiia (53)5 2011
Abstract
Changes in optical properties of human adipose tissue cells after photodynamic exposure in vitro were found and investigated. Analysis of the kinetics of the process was realized by means of photomicrography of the object investigated. The statistical computer processing of digital photos obtained ga...
|
PMID: 21786686
PDF is available here.
PDF is available here.
Abstract
The review briefs recent advances in application of biosensors for determining biological oxygen demand (BOD) in water. Special attention is focused on the principles of operation of microbial BOD sensors; the information about biorecognition elements in such systems and the methods used for immobili...
|
PMID: 21442914
PDF is available here.
PDF is available here.
Abstract
We combined resting-state functional connectivity mapping with optical intrinsic signal imaging (fcOIS). We demonstrate functional connectivity in mice through highly detailed fcOIS mapping of resting-state networks across most of the cerebral cortex. Synthesis of multiple network connectivity patte...
|
PMID: 21283729
PDF is available here.
PDF is available here.
Abstract
We study the generation of sparse multi-focal ultrasonic distributions using phase-only modulation in ultrasonic phased arrays. We analyse the relative performance of an existing algorithm for generating multifocal ultrasonic distributions and new algorithms that we adapt from the field of optical d...
|
PMID: 20720281
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
We investigate the chromatic dispersion properties of silicon channel slot waveguides in a broad spectral region centered at ~1.5 μm. The variation of the dispersion profile as a function of the slot fill factor, i.e., the ratio between the slot and waveguide widths, is analyzed. Symmetric as well...
|
PMID: 20940978
PDF is available here.
PDF is available here.
Optics Express (18)20 2010
Abstract
Photorefractive optical damage of single beams in LiNbO(3) crystals is analyzed within a framework of two photoactive centres (Fe(2+)/Fe(3+) and Nb(Li) (4+)/Nb(Li) (5+)). It compares model simulations and significant experimental measurements in LiNbO(3) waveguides. A good agreement is found in the...
|
PMID: 20940980
PDF is available here.
PDF is available here.
Lab On a Chip (10)18 2010
Abstract
This paper presents a rapid, ultra-low-cost approach to fabricate microfluidic devices using a polyolefin shrink film and a digital craft cutter. The shrinking process (with a 95% reduction in area) results in relatively uniform and consistent microfluidic channels with smooth surfaces, vertical sid...
|
PMID: 20680207
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We demonstrate that hollow-core Bragg fibers with quasiperiodic dielectric multilayer cladding can achieve low loss transmission over a broadband wavelength range of more than an octave (from 0.81 μm to 1.7 μm). The periods of the Bragg blocks follows a geometrical progression with a common ratio...
|
PMID: 20940759
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
A collimation method of misaligned optical systems is proposed. The method is based on selectively nullifying main alignment-driven aberration components. This selective compensation is achieved by the optimal adjustment of chosen alignment parameters. It is shown that this optimal adjustment can be...
|
PMID: 20940821
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...
|
PMID: 20721058
PDF is available here.
PDF is available here.
Abstract
Optics Letters (35)12 2010
Abstract
We develop light-driven optoelectronic tweezers based on the organic photoconductive material titanium oxide phthalocyanine. These tweezers function based on negative dielectrophoresis (nDEP). The dynamic manipulation of a single microparticle and cell patterning are demonstrated by using this light...
|
PMID: 20548352
PDF is available here.
PDF is available here.
Abstract
We have developed a new localization-based imaging technique achieving almost isotropic subdiffraction resolution in 3D. A tilted mirror is used to generate a side view in addition to the front view of activated single emitters, allowing their 3D localization to be precisely determined for superreso...
|
PMID: 20472826
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
Localization of an electromagnetic field can be achieved by transformation optics using metamaterials. A coordinate transformation structure different from traditional resonator is proposed. Wherein, arbitrary frequency of the whole band of electromagnetic wave can be localized without energy loss,...
|
PMID: 20589050
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We propose a double image encryption by using random binary encoding and gyrator transform. Two secret images are first regarded as the real part and imaginary part of complex function. Chaotic map is used for obtaining random binary matrix. The real part and imaginary part of complex function are e...
|
PMID: 20589065
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
The authors report on the fabrication of hybrid planar micro-resonators based on InGaAs microdisks with an evaporated organic material. Samples of InGaAs grown on InP(100) substrates are obtained by Chemical Beam Epitaxy, and microdisks of InGaAs with different diameters are fabricated by focused io...
|
PMID: 20589023
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We report the realization of coherent electro-optical detection of nanosecond terahertz (THz) pulses from an optical parametric oscillator, which is pumped by a Q-switched nanosecond Nd:YVO4 laser at 1064 nm and emits at approximately 1.5 THz. The beam profile and wavefront of the THz beam at focus...
|
PMID: 20588993
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We present a solid phantom characterization technique based on time resolved transmittance measurement of light through a relatively small phantom sample. The small size of the sample enables characterization of every material batch produced in a routine phantoms production. Time resolved transmitta...
|
PMID: 20589010
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We show demodulation and demultiplexing of multi-channel WDM differential phase-shift-keying (DPSK) signals operating simultaneously at 10 Gb/s and 40 Gb/s using a 1x4 wavelength selective switch. We achieve error-free performance for four channels equally spaced by 100 GHz propagated over an 85 km...
|
PMID: 20589024
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
This paper proposes a method to design an incident-angle-insensitive polarization-independent polarization rotator. This polarization rotator is composed of layers of impedance-matched anisotropic metamaterial (IMAM) with each layer's optical axes gradually rotating an angle. Numerical simulation ba...
|
PMID: 20589061
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We demonstrate a diffractive maskless lithographic system that is capable of rapidly performing both serial and single-shot micropatterning. Utilizing the diffractive properties of phase holograms displayed on a spatial light modulator, arbitrary intensity distributions were produced to form two and...
|
PMID: 20589036
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We report on efficient cw high-power second harmonic generation in a periodically poled LiTaO3 crystal placed in a resonant enhancement cavity. We tested three configurations, differing in the coupling mirror reflectivity, and a maximum conversion efficiency of about 76%, corresponding to 6.1 W of g...
|
PMID: 20588954
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We analytically investigate the coupling of light from liquid-core waveguides to conventional solid-core waveguides and a series of other optical properties of liquid waveguides in order to gauge the practicality of such a system for use in microfluidically reconfigurable photonic systems. A finite...
|
PMID: 20588953
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We design and fabricate pedestal-type, 15 microm diameter silicon nitride microdisk resonators on Si chip with horizontal air-slot using selective wet etching between Si, SiO2, and SiNx. As the slot structure is determined by deposition process, air slots that are as thin as 40 nm and as deep as 5 m...
|
PMID: 20588980
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We investigate the impact of the Ti adhesion layer on the overall response of Au-based nano-scale SRRs. The results quantify the extent to which the overall difference in the resonance frequencies between Au- and Al-based SRRs is due to the presence of the Ti. We show that even a 2-nm-thick Ti layer...
|
PMID: 20588979
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present a rigorous method for calculating the local absorption in periodic structures. The computation depends primarily on the calculation of the electric field inside the structure. Since the standard definitions produce unsatisfactory results, we use a modified version of a method published by...
|
PMID: 20588892
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
Detailed numerical investigations are undertaken of wavelength reused bidirectional transmission of adaptively modulated optical OFDM (AMOOFDM) signals over a single SMF in a colorless WDM-PON incorporating a semiconductor optical amplifier (SOA) intensity modulator and a reflective SOA (RSOA) inten...
|
PMID: 20588829
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present light harvesting of aqueous colloidal quantum dots to nonradiatively transfer their excitonic excitation energy efficiently to dye molecules in water, without requiring ligand exchange. These as-synthesized CdTe quantum dots that are used as donors to serve as light-harvesting antennas ar...
|
PMID: 20588924
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We present the analysis, optimization and implementation of several Stokes polarimeter configurations based on a set-up including two variable retarders. The polarimeter analysis is based on the Mueller-Stokes formalism, and as a consequence, it is suitable to deal with depolarized light. Complete S...
|
PMID: 20588831
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We propose and demonstrate error-free conversion of a 40 Gbit/s optical time division multiplexed signal to 4 x 10 Gbit/s wavelength division multiplexed channels based on cascaded second harmonic and difference frequency generation in a periodically poled lithium niobate waveguide. The technique re...
|
PMID: 20588881
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...
|
PMID: 20588856
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
A novel scheme using single phase modulator for simultaneous time domain spectral phase encoding (SPE) signal generation and DPSK data modulation is proposed and experimentally demonstrated. Array- Waveguide-Grating and Variable-Bandwidth-Spectrum-Shaper based devices can be used for decoding the si...
|
PMID: 20588838
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
Resonant output energy enhancement in a singly resonant nondegenerate type-I optical parametric oscillator with a volume Bragg grating output coupler is demonstrated. The resonances occur when the pump laser and parametric oscillator cavity length ratio is an integer or a fraction of small integers....
|
PMID: 20588926
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We propose a diffractive model to evaluate the modulation diffraction efficiency of phase diffractive optical elements (DOEs) in the presence of phase fluctuations. Best results are obtained for the most stable electrical sequence even though its phase depth is as small as 280 degrees . The results...
|
PMID: 20588910
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We investigate the spontaneous emission modifications when ensembles of quantum dots (QDs) with differing emission frequencies and finite Lorentzian linewidths are coupled to a microcavity. Using contour integrals we develop a general expression for the rate enhancement when neither the emitter nor...
|
PMID: 20588877
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
We report the first demonstration of polarisation insensitive all-optical wavelength conversion (AOWC) for single wavelength channel 640 Gbit/s return-to-zero differential-phase-shift-keying (RZ-DPSK) signal and 1.28 Tbit/s polarisation multiplexed (Pol-Mux) RZ-DPSK signals using a 100-m polarisatio...
|
PMID: 20588850
PDF is available here.
PDF is available here.
Optics Express (18)10 2010
Abstract
Two optical antenna designs incorporating structures termed charge and current reservoirs are proposed to realize localized high electric and magnetic field enhancement, respectively. Simulation results show that the fan-rod electric antenna design combines the advantages of the rod antenna and the...
|
PMID: 20588894
PDF is available here.
PDF is available here.
Perceptual and Motor Skills (110)2 2010
Abstract
This study assessed a new type of microswitch designed to enable a woman with acquired brain injury and profound multiple disabilities to access environmental stimulation through lip movements. The microswitch involved two optic sensors aimed at detecting changes in lip positions. Data showed that t...
|
PMID: 20499559
PDF is available here.
PDF is available here.
Neurological Surgery (38)4 2010
Abstract
Surgical loupes and headlights are mainly used in the cardiovascular field. Neurosurgeons use a loupe and a headlight less commonly especially in Japan. In our institute, all six neurosurgeons have their own loupes and two headlights. Both an operator and an assistant use loupes and headlights in ev...
|
PMID: 20387574
PDF is available here.
PDF is available here.
Applied Optics (49)10 2010
Abstract
A new design and fabrication method is presented for creating large-format (>100 mirror facets) image mappers for a snapshot hyperspectral biomedical imaging system called an image mapping spectrometer (IMS). To verify this approach a 250 facet image mapper with 25 multiple-tilt angles is designed f...
|
PMID: 20357875
PDF is available here.
PDF is available here.
Abstract
Multi-stage cascade impactors (CIs) are the preferred measurement technique for characterizing the aerodynamic particle size distribution of an inhalable aerosol. Stage mensuration is the recommended pharmacopeial method for monitoring CI "fitness for purpose" within a GxP environment. The Impactor...
|
PMID: 20309653
PDF is available here.
PDF is available here.
Abstract
We demonstrate intraoperative graft assessment using the HyperEye system.
We investigated the intraoperative graft patency using both the HyperEye system and transittime flowmetry (TFM) in 51 patients between April 2007 and April 2009 while ICG dye was injected through a central veno...
|
PMID: 20155342
PDF is available here.
PDF is available here.
Abstract
We have developed a laser and focused ion beam (FIB) compound system to process an optical component device with an ultrafine precision minute surface structure and a micromedical device. This machine consists of an FIB and three types of lasers with an atomic force microscope. This system can fabri...
|
PMID: 20192442
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We propose a relay ring resonator structure which comprises multiple cascaded microring resonators, in which the drop waveguide of a microring resonator is also the input waveguide of the subsequent microring resonator, and so forth. Thus, the transmission response of the relay ring resonator struct...
|
PMID: 20173859
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We demonstrate that fiber-based frequency combs with multi-branch configurations can transfer both linewidth and frequency stability to another wavelength at the millihertz level. An intra-cavity electro-optic modulator is employed to obtain a broad servo bandwidth for repetition rate control. We in...
|
PMID: 20173994
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We proposed a combination of 4 subwavelength structured gratings (SWGs) used as an achromatic quarter-wave plate (QWP) applied to MWIR & LWIR bandwidths. Design method using effective medium theory and optimization algorithms is described in detail. The simulation results led to the possibility of a...
|
PMID: 20173997
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
A novel tapered dielectric waveguide solar concentrator is proposed for compound semiconductor solar cells utilizing optical fiber preform. Its light collecting capability is numerically simulated and experimentally demonstrated for feasibility and potential assessments. Utilizing tapered shape of a...
|
PMID: 20174005
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We present a new lensless incoherent holographic system operating in a synthetic aperture mode. Spatial resolution exceeding the Rayleigh limit of the system is obtained by tiling digitally several Fresnel holographic elements into a complete Fresnel hologram of the observed object. Each element is...
|
PMID: 20173918
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We demonstrate the shift characteristics of four-wave mixing (FWM) beam spots which are controlled by the strong laser fields via the large cross-Kerr nonlinearity. The shift distances and directions are determined by the nonlinear dispersions. Based on such spatial displacements of the FWM beams, a...
|
PMID: 20173911
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We demonstrate spectral beam combining of a 980 nm tapered diode laser bar. The combined beam from 12 tapered emitters on the bar yielded an output power of 9.3 W at 30 A of operating current. An M2 value of 5.3 has been achieved along the slow axis. This value is close to that of a free running sin...
|
PMID: 20173910
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We define three spatial coordinate transformations which show the possibility of designing a taper between two different waveguides. A parametric study is presented for the three transformations and we propose achievable values of permittivity and permeability that can be obtained with existing meta...
|
PMID: 20173898
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
This is a comment in response to the claims made in a recent paper by Zhang and Ding [Opt. Express 17, 22235-22239 (2009)]. The authors claimed that an error has been found in a previous paper [Opt. Express 12, 3377-3382 (2004)] and provided a "guess" of how the Poynting vector was calculated. These...
|
PMID: 20173897
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond to the energy difference between the injector ground state and the upper laser l...
|
PMID: 20173895
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
We propose to design the metallic superlens with close to the cutoff condition of the long-range SPP mode to balance the SPP amplification and the flatness of the transfer function, and thus eliminating the sidelobes in the image. The design experiments for the Al superlens at 193 nm with both the t...
|
PMID: 20173894
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
Linear and nonlinear characteristics of devices using millimeter-scale spools of highly nonlinear fiber are experimentally investigated within 2000-2400nm spectral range. Coils with radius larger than 3.5 mm indicate that macro-bending induced radiation loss is negligible up to 2400nm. Devices with...
|
PMID: 20173863
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
Our numerical simulation has shown that design optimization of the PCF-LPG configuration can lead to a field power overlap as high as 22% with a confinement loss of less than 1 dB/m in the cladding mode....
|
PMID: 20173870
PDF is available here.
PDF is available here.
Optics Express (18)2 2010
Abstract
A method to suppress polarization-fluctuation induced drift in resonator fiber optic gyro (R-FOG) is demonstrated by a polarization-maintaining fiber (PMF) resonator with twin 90 degrees polarization-axis rotated splices. By setting the length difference of the fiber segments between two 90 degrees...
|
PMID: 20173995
PDF is available here.
PDF is available here.