Improving the performance of gold nanohole array biosensors by controlling the optical collimation conditions
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Abstract:
An experimental investigation on how the bulk and surface sensitivities of gold nanohole arrays fabricated by interference lithography affect the degree of white light beam collimation is presented. The optical transmission response of nanohole arrays has been recorded by focused and collimated beam transmission spectra. The results show that both the bulk and surface sensitivities for the collimated case are much larger than for the focused case. In particular, the shape of the spectra was dependent on the degree of beam collimation. The results showed that improved sensing performance (around 3.5 times) and higher figure of merit (around 4.4 times) can be obtained by simply adjusting the incident/collection experimental conditions in transmission measurements.Keywords:
Collimated light
Figure of Merit
Beam expander
Extraordinary optical transmission
We propose a kind of freeform shaping optics for compound collimated beam shaping. This design can achieve prescribed uniform rectangular illuminations without concern for the initial pattern, position or intensity of collimated beam.
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Beam expander
Position (finance)
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This paper presents a lossless method and apparatus to transform a collimated straight line beam into a collimated spherical arc beam. This apparatus consists of two coaxial axicons, and the propagation direction of the incoming beams is parallel to the optical axis of the two axicons. At least one of the axicons has to be a converging one. The same method can also be used to transform a collimated rectangular beam into a collimated meniscus shape beam. By reversing the beam direction, a collimated spherical arc beam input can be transformed into a collimated straight line beam output, and a collimated meniscus shape beam can be converted into a collimated rectangular beam. A collimated spherical arc beam of certain radius can also be transformed into a collimated spherical arc beam of any desired radius. Numerical simulations and ray trace examples are provided.
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Coaxial
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A new accurate method for long focal-length measurement based on Talbot interferometry is proposed. A divergent beam and two Ronchi gratings of different periods are employed, as the alternative of the collimated beam and two identical gratings, to achieve higher measurement accuracy. Moreover, with divergent beam, lenses of large aperture can be easily measured without scanning, which is required when it comes to traditional collimated beam. Numerical analysis and experiments were carried out. The results demonstrate the proposed method features remarkably high accuracy and repeatability.
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Beam expander
Repeatability
Aperture (computer memory)
Talbot effect
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This paper presents a lossless method and apparatus to transform a collimated straight line beam into a collimated spherical arc beam. This apparatus consists of two coaxial axicons, and the propagation direction of the incoming beams is parallel to the optical axis of the two axicons. At least one of the axicons has to be a converging one. The same method can also be used to transform a collimated rectangular beam into a collimated meniscus shape beam. By reversing the beam direction, a collimated spherical arc beam input can be transformed into a collimated straight line beam output, and a collimated meniscus shape beam can be converted into a collimated rectangular beam. A collimated spherical arc beam of certain radius can also be transformed into a collimated spherical arc beam of any desired radius. Numerical simulations and ray trace examples are provided.
Collimated light
Line (geometry)
Beam expander
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The transformation from an annular beam intensity distribution to a cylindrical one is considered. A simple refractive optical radiation intensity redistributor was designed and fabricated, and its performance is discussed. Experimental results show that the redistributor is a useful optical element for transformations of collimated annular beam irradiance.
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Beam expander
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Radiant intensity
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A new shear plate collimation tester on the basis of a single wedge plate using two-time rotatable ways[1] have been developed[2]. It is mainly used to test laser beam collimation, divegrence and amount of defocusing of optical systems in collomator, beam expander and telescope. It can be also used to test wavefront aberrations and laser parameters and to adjust optical systems. In this paper. The basic principles, quantitative interpretation, accuracy analyses, functions and features of the tester are presented.
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Wedge (geometry)
Beam expander
Wavefront sensor
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Through breathes out Hartmann spherical-aberration automatic measurement collimation which resolved collimated(parallel) beam of departure,based on the Gaussian optics theory,Analyse the large collimated beam expander magnification Principle through the project angle。Achieve a change in laser beam diameter and divergence angle of the beam expander collimator system design,and has been verified through the simulation to meet the optical system aberration measurement requirements Hartmann spherical-aberration measurement.
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Collimator
Beam expander
Beam parameter product
Gaussian beam
Beam divergence
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A figure of merit of a collimating system was proposed by Dewey and Sinclair to describe the ability of a detecting system to distinguish a region containing a different concentration of a gamma emitting isotope from that of its surroundings.
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A collimated optical beam is required in several applications such as metrology, optical processing, free space propagation of information, and laser-based instrumentation. Prior to the advent of the laser, the size of the aperture at the focal point of a collimating lens determined the degree of collimation based purely on geometrical optics consideration. Because the laser beam can be focused to a tiny size, effectively making it a point source, the degree of collimation is governed by diffraction at the aperture of a collimating lens. A large number of procedures have been developed to collimate the beam. We examine the development of these techniques from the historical perspective.
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Aperture (computer memory)
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