期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 29, 期 5, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2023.3274418
关键词
Evanescent waves; fourier transforms; subwave-length wave technology; terahertz radiation
Although the experimental detection of evanescent orders is challenging, Fourier transformed terahertz spectroscopy (FTTS) through near-field scanning terahertz microscopy (NSTM) can overcome the limitations and successfully detect the non-propagating evanescent orders originating from a 1-dimensional dielectric grating. The identification of evanescent orders demonstrates the potential of FTTS in exploring near-field systems and paves the way for studying other near-field phenomena in terahertz photonic systems.
Although evanescent orders offer interesting physics, the experimental detection of these modes are very challenging task because of their inherent characteristics. Evanescent orders are non-propagating in nature making it impossible to detect in the far-field. At the same time, near-field detection is also complicated because of the concurrence of propagating and non-propagating diffraction orders. In order to overcome these hindrances, we introduce Fourier transformed terahertz spectroscopy (FTTS) through near-field scanning terahertz microscopy (NSTM) to experimentally detect the non-propagating evanescent orders originating from a 1-dimensional dielectric grating for both the TE and TM configurations. Our studies demonstrate exponential decay of mode strengths away from the grating-air interface confirming them as evanescent waves. Identification of evanescent orders demonstrate the sound competences that FTTS can offer in exploring near-field systems. We believe, FTTS based approaches can pave new avenues on studying other near-field phenomena in terahertz photonic systems.
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