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Terahertz dispersion using multi-depth phase modulation grating
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DOI：10.1364/OE.27.012732.png)
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Abstract
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We present a multi-depth phase modulation grating (MPMG) in the terahertz range making real-time multichannel Fourier-transform spectroscopy available in a stationary manner. The calculation of the Fraunhofer diffraction field distribution and diffraction efficiency of an MPMG indicates that the zeroth-order diffraction light of an MPMG carries phase information and its diffraction intensity is modulated by the groove depth. A good agreement is found between the measurements of the 0th- and +/- 1st-order diffraction efficiency at 0.5 and 0.34 THz and the simulation. The frequencies of the terahertz source retrieved from the zeroth-order diffraction intensity at 0.5, 0.4, and 0.34 THz are identical to the actual frequencies. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keywords:
FOURIER-TRANSFORM SPECTROMETER
SPECTROSCOPY
Journal
IF:
3.3
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6.1W
Citations:
14.3W
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