Invited Article: Narrowband terahertz bandpass filters employing stacked bilayer metasurface antireflection structures

Chun Chieh Chang, Li Huang, John Nogan, Hou Tong Chen

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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 operational 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.

Original languageEnglish
Article number051602
JournalAPL Photonics
Volume3
Issue number5
DOIs
Publication statusPublished - 2018 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications

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