BIOMEDICAL ARTICLES
Comparison of lens and Fresnel null correctors.
Fresnel null correctors are compared with classical Offner and Hindle null correctors for both optical performance and system sensitivities to errors of construction and placement in the test setup. Fresnel null correctors are closely related to circular diffractive null correctors, the main difference being that a Fresnel uses […]
Dependence on the sample width of signals from a near-field optical microscope.
We numerically investigated signals from a scanning near-field optical microscope (NOM) for samples of various sizes by using the finite-difference time-domain method. Under the usual conditions that apply to detection, the signal intensity depends on the width of the sample, even […]
Zero-birefringence polymer by the anisotropic molecule dope method.
We propose using the anisotropic molecule dope method for synthesizing a zero-birefringence polymer that showed no orientational birefringence at any orientation degree of polymer chains. In this method a rodlike molecule with polarizability anisotropy was chosen to compensate orientational birefringence. The zero-birefringence polymer was synthesized […]
Effects of a Small Inclination Misalignment in Talbot Interferometry by use of Gratings with Arbitrary Line Orientation. I. Theoretical Analysis.
We discuss the effects of a general small inclination misalignment, which is formed by rotation of the beam-splitter grating around an axis that is laid on the grating plane and that has an […]
Measurement of the complex refractive index of isotropic materials with mueller matrix polarimetry.
The complex refractive index of materials at infrared wavelengths is often determined when absorption measurements are made at selected wavelengths, and then the Kramers-Kronig relationship is used to calculate the real part of the index. Because many organic materials are […]
Dynamic phase-shifting photoelasticity.
The application of phase-shifting photoelasticity to a real-time dynamic event involves simultaneous recording of the four phase-shifted images. Here an instrument, believed to be novel, is developed and described for this purpose. Use of a Multispec Imager is introduced into digital photoelasticity for the first time to our knowledge. This […]
Holography with surface-plasmon-coupled waveguide modes.
We report on an attempt to use the enhancement effect of surface-plasmon resonance to improve the image quality of a waveguide hologram. With a structure consisting of a waveguide medium sandwiched between a metal film and a hologram, we obtained holographic images reconstructed by surface-plasmon-coupled waveguide modes. Comparison […]
Design of Efficient LightPipes for Illumination by an Analytical Approach.
We present the concept of principal sections of a lightpipe to analyze the propagation of light through the lightpipe by total internal reflection. Only the principal sections determine the acceptance angle and thus help in the identification of regions where the leakage occurs […]
Observation of a fast-formed absorption grating and a slowly formed phase grating in undeveloped dichromated gelatin.
Real-time diffraction efficiency is measured during hologram formation in undeveloped dichromated gelatin (DCG) film. The main features of real-time diffraction efficiency of undeveloped DCG reveal double peaks with increasing exposure time. Adopting the grating translation technique, we […]
Separating the fluorescence and reflectance components of coral spectra.
The optical signal leaving the surface of fluorescing corals is a combination of elastic and inelastic scatter. A new experimental method was developed to separate the fluorescence and the reflectance components that involves measurements with and without a long-pass cutoff filter that eliminates the […]
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