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Proceedings Paper

Optimization of the signal-to-noise ratio for terahertz radiation generated by photomixing in laser-assisted field emission
Author(s): Mark J. Hagmann
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Paper Abstract

Quantum simulations, supported by experiments, show that photomixing in laser-assisted field emission offers promise as a new mechanism for wide-band tunable sources at terahertz frequencies. In this technique the bandwidth is only limited by the methods for coupling power from the current oscillations that are generated in photomixing, and not by the fundamental processes that generate the mixer current. Photomixing is simulated as a stationary stochastic process in which the frequencies and phases of the incident optical radiation are random variables. The waveform of the current is determined by solving the time-independent Schroedinger equation at discrete time steps for which the potential barrier is a superposition of the instantaneous value of the radiation field and the static barrier. These samples satisfy the criteria of a Poisson process to allow for the discrete emission of electrons at the specified total current. The one-sided power spectral density is calculated with the FFT to produce periodogram estimates. The simulations show that the signal-to-noise ratio may be increased by (1) raising the power flux density of each laser, (2) raising the DC static current, (3) reducing the linewidth of each laser, and (4) using a static current densityof no more than 1010 A/m2.

Paper Details

Date Published: 25 May 2004
PDF: 11 pages
Proc. SPIE 5472, Noise and Information in Nanoelectronics, Sensors, and Standards II, (25 May 2004); doi: 10.1117/12.546860
Show Author Affiliations
Mark J. Hagmann, Deseret Electronics Research Corp. (United States)

Published in SPIE Proceedings Vol. 5472:
Noise and Information in Nanoelectronics, Sensors, and Standards II
Janusz M. Smulko; Yaroslav Blanter; Mark I. Dykman; Laszlo B. Kish, Editor(s)

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