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Title:
Demonstration of a linear optical true-time delay device by use of a microelectromechanical mirror array
Authors:
Rader, Amber; Anderson, Betty Lise
Affiliation:
Department of Electrical Engineering, 205 Dreese Laboratory, The Ohio State University, 2015 Neil Avenue, Columbus, Ohio 43210
Publication:
Applied Optics, Volume 42, Issue 8, pp. 1409-1416 (2003).
Publication Date:
03/2003
Origin:
STI
Keywords:
optical delay lines, micromechanical devices, electromechanical effects, mirrors, optical arrays, optical losses
Abstract Copyright:
(c) 2003: Optical Society of America
DOI:
10.1364/AO.42.001409
Bibliographic Code:
2003ApOpt..42.1409R

Abstract

We present the design and proof-of-concept demonstration of an optical device capable of producing true-time delay(s) (TTD)(s) for phased array antennas. This TTD device uses a free-space approach consisting of a single microelectromechanical systems (MEMS) mirror array in a multiple reflection spherical mirror configuration based on the White cell. Divergence is avoided by periodic refocusing by the mirrors. By using the MEMS mirror to switch between paths of different lengths, time delays are generated. Six different delays in 1-ns increments were demonstrated by using the Texas Instruments Digital Micromirror Device® as the switching element. Losses of 1.6 to 5.2 dB per bounce and crosstalk of -27 dB were also measured, both resulting primarily from diffraction from holes in each pixel and the inter-pixel gaps of the MEMS.
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Database: Astronomy
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