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Terahertz beam steering and variable focusing using programmable diffraction gratings
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DOI：10.1364/OE.21.002347.png)
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Abstract
En 中文
We propose a freely programmable THz diffraction grating based on an electrostatically actuated, computer controlled array of metallic cantilevers. Switching between different grating patterns enables tailoring spatio-temporal profiles of the THz waves. By characterizing the device with spatially resolved THz time domain spectroscopy, we demonstrate beam steering for a wide frequency band extending from 0.15 THz to 0.9 THz. The steerable range at 0.3 THz exceeds 40 degrees. Focusing is also demonstrated by programming a chirped grating. The proposed approach could be employed to mimic arbitrary diffraction optics, enabling highly integrated and extremely flexible systems indispensable for THz stand-off imaging and communications. (C) 2013 Optical Society of America
Keywords:
PHASE MODULATOR
SPECTROSCOPY
TECHNOLOGY
SHIFTER
PULSES
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