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14 May 2018 Narrowband terahertz bandpass filters based on metasurfaces (Conference Presentation)
Hou-Tong Chen, Chun-Chieh Chang, Li Huang, John Nogan
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Proceedings Volume 10656, Image Sensing Technologies: Materials, Devices, Systems, and Applications V; 1065616 (2018) https://doi.org/10.1117/12.2301006
Event: SPIE Commercial + Scientific Sensing and Imaging, 2018, Orlando, FL, United States
Abstract
In this work we experimentally demonstrate high-performance narrowband terahertz (THz) bandpass filters through cascading multiple bilayer metasurface antireflection structures. Each bilayer metasurface, consisting of a square array of silicon pillars with a self-aligned top gold resonator-array and a complementary bottom gold slot-array, enables near-zero reflection and simultaneously close-to-unity single-band transmission at designed operation frequencies in the THz spectral region. The THz bandpass filters based on stacked bilayer metasurfaces allow a fairly narrow, high-transmission passband, and a fast roll-off to an extremely clean background outside the passband, thereby providing superior bandpass performance. The demonstrated scheme of narrowband THz bandpass filtering is of great importance for a variety of applications where spectrally clean, high THz transmission over a narrow bandwidth is desired, such as THz spectroscopy and imaging, molecular detection and monitoring, security screening, and THz wireless communications.
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Hou-Tong Chen, Chun-Chieh Chang, Li Huang, and John Nogan "Narrowband terahertz bandpass filters based on metasurfaces (Conference Presentation)", Proc. SPIE 10656, Image Sensing Technologies: Materials, Devices, Systems, and Applications V, 1065616 (14 May 2018); https://doi.org/10.1117/12.2301006
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KEYWORDS
Bandpass filters
Terahertz radiation
Imaging spectroscopy
Gold
Molecular spectroscopy
Antireflective coatings
Image filtering
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