NDLI: Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

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Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

Content Provider	Semantic Scholar
Author	Carthy, Joanna L. Gow, Paul C. Berry, Sam Mills, Ben Apostolopoulos, Vasilis
Copyright Year	2017
Abstract	We show that, when large-area multiplex terahertz semiconductor emitters, that work on diffusion currents and Schottky potentials, are illuminated by ultrashort optical pulses they can radiate a directional electromagnetic terahertz pulse which is controlled by the angular spectrum of the incident optical beam. Using the lens that focuses the incident near-infrared pulse, we have demonstrated THz emission focusing in free space, at the same point where the optical radiation would focus. We investigated the beam waist and Gouy phase shift of the THz emission as a function of frequency. We also show that the polarization profile of the emitted THz can be tailored by the metallic patterning on the semiconductor, demonstrating radial polarization when a circular emitter design is used. Our techniques can be used for fast THz beam steering and mode control for efficiently coupling to waveguides without the need for THz lenses or parabolic mirrors.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://eprints.soton.ac.uk/416676/1/10.1007_s10762_017_0452_4.pdf
Language	English
Access Restriction	Open
Subject Keyword	Amplifier AngularJS Catheter guide wire, device Double Minutes Electronic Amplifiers Emitter Device Component Excitation Expectation propagation Experience Experiment Lambert's cosine law Lens (device) License Line Printer Daemon protocol Modulation Modulator Device Component Multiplexing Parabolic antenna Polarization (waves) Pumping (computer systems) Quantum Radial (radio) Radial polarization Radiate Radiation Pneumonitis Schottky barrier Semiconductor Spatial light modulator Spectrometry Sulfanilamide Terahertz Titanium Waveguide Device Component polarity pump (device)
Content Type	Text
Resource Type	Article

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