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Optics & Laser Technology

Optical properties of Cd20Se80−xMx (M: Zn, In, and Sn) thin film alloys

Tue, 2013-02-05 15:03 — Guest

July 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49

A parallel optical implementation of arithmetic operations

Thu, 2013-01-31 12:04 — Guest

July 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49

In this paper we present an optical processor for performing arithmetic operations in parallel. The implementation of arithmetic operations makes it possible to perform various computational tasks. As case studies we solve the bounded subset sum problem in parallel and perform parallel primality testing. The processor uses two-dimensional optoelectronic planes for both performing logic operations and storing data, which eliminates the need for transferring data from electronic devices in each step of the computation. The presented processor seems easier to realize than most of the past parallel optical processors due to its simpler and more compact architecture, while staying powerful enough to carry out computations from diverse applications.

Surface wave-induced enhancement of the Goos–Hänchen shift in single negative one-dimensional photonic crystal

Thu, 2013-01-31 12:04 — Guest

July 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49

The Goos–Hänchen (GH) shift in one-dimensional photonic crystal (1DPC), composed of alternate ε-negative and μ-negative materials, is theoretically investigated. It is demonstrated that larger shifts can be obtained when surface modes are excited. It is also found that the magnitude of the lateral GH shift is closely related to intrinsic loss factor. The results show that for a definite value of loss and for values larger than that, backward surface waves which lead to negative lateral GH shifts can be excited. On the other hand, there are large positive GH shifts for small loss factor less than aforementioned definite loss. The GH shift is very sensitive to the thickness of air gap which is necessary to excitation of the surface waves.

An optical-adjustable illumination pattern with a surface-structured diffuser compensated by index-matching liquid

Wed, 2013-01-30 05:04 — Guest

July 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49

This paper presents a new luminaire for light-emitting diode (LED) lighting with an adjustable light pattern. The luminaire contains secondary optics and a surface-structured diffuser to spread the light pattern to fit a specified illumination area. The structured surface with a micro-lens array can be filled with index-matching liquid so that the lighting pattern is adjustable. A detailed simulation is presented for both optical efficiency and variation of the light pattern with variation of the refractive index of used liquid, and a corresponding experiment is demonstrated.

Design, Simulation and Optimisation of a Fibre-optic 3D Accelerometer

Mon, 2013-01-28 21:03 — Guest

July 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49

Using an inertia pendulum comprised of two prisms, flexible beams and an elastic flake, we present a novel fibre-optic 3D accelerometer design. The total reverse reflection of the cube-corner prism and the spectroscopic property of an orthogonal holographic grating enable the measurement of the two transverse components of the 3D acceleration simultaneously, while the longitudinal component can be determined from the elastic deformation of the flake. Due to optical interferometry, this sensor may provide a wider range, higher sensitivity and better resolving power than other accelerometers. Moreover, we use finite element analysis to study the performance and to optimise the structural design of the sensor.

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