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An array of unbiased CW terahertz photomixer emitters based on excitation of different waveguide modes in the bimetallic contact grating is introduced. Unlike previous structures, this emitter does not require any external bias voltage. For photocarrier acceleration it rather makes use of the built-in electrostatic field formed in the vicinity of the Schottky contact (electrode-photoconductor) interface...
We introduce an array of new antenna-coupled and unbiased terahertz photomixer. Unlike previous structures, this emitter does not require any external bias voltage. In this work, we show that an array of asymmetric (bi-metallic) MSM structures, whose unit cell (pitch) is made of a pair of dissimilar Schottky contacts on LTG-GaAs can act as bias free CW THz photomixer emitters. For photocarrier acceleration...
A new unbiased terahertz photoconductive emitter is introduced. Unlike previous structures, this emitter does not require any external bias voltage. For photocarrier acceleration it rather makes use of the built-in electrostatic Schottky contact field formed at the electrode-photoconductor interface. A hybrid numerical simulation method is used to model and analyze this phenomenon.
A subwavelength terahertz plasmonic Y-branch switch based on graphene/gold hybrid structure is proposed. By controlling the graphene optical conductivity via modifying its chemical potential through a variable applied voltage, the real and imaginary parts of the effective refractive index of the hybrid structure can be controlled. Numerical results obtained from finite element method simulation show...
In this paper, we present a new method for designing an optofluidic interferometric sensor to measure the pressure and flow rate based on generated optical ring pattern. This sensor consists of a flexible air gap optical cavity whose curvature depends on the pressure. When illuminated by a monochromatic light, the curved surface generates the interference patterns. In our numerical simulations, we...
In this paper we study the resonant state and transmission characteristics in an infiltrated silicon triangular lattice photonic crystal channel drop filter. The structure is composed of two cavities that are created by increasing the radii and infiltrating with a fluid of specific refractive indices of two holes surrounding the bus waveguide. According to the theoretical analysis, in order to have...
A HSPICE equivalent-circuit model for analyzing the frequency response of segmented traveling wave electroabsorption modulators (STEAM) is presented. The model is based on non-physical model for lossy transmission line. The analysis indicates that STEAM can achieve much wider bandwidth than the lumped electroabsorption modulator (LEAM) and TWEAM counterparts, with a small penalty in E/O conversion...
In this paper we have developed a new imaging method which can obtain the grey levels directly from the output waveform of Pulsed Laser Radar (PLR). A simple digital signal processing technique and multi layer perceptrons (MLP) type neural network (NN) have been used to obtain the grey level information from the pulse shapes. The method has been implemented in a real PLR to improve contrast and speed...
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