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Indexed by:期刊论文

Date of Publication:2018-07-18

Journal:ADVANCED OPTICAL MATERIALS

Included Journals:SCIE

Volume:6

Issue:14

ISSN No.:2195-1071

Key Words:metamaterials; mid-infrared; phase change materials; surface plasmon resonance; tunable

Abstract:The intense light-matter interaction of plasmonic metasurfaces provides an appealing platform for optical sensing. To date, most metasurface sensors are not spectrally tuned. Moreover, they operate in a total reflection mode, which complicates the optical setup. Transmissive tunable filters are therefore desirable. A mid-infrared (M-IR) tunable metasurface is described that operates in transmission mode. The resonant frequency of the filter is tuned by nonvolatile phase transitions to the dielectric properties of the chalcogenide material Ge2Sb2Te5. A broad transmittance spectral shift of 500 nm across the M-IR region is experimentally demonstrated. This shift is in good agreement with finite-difference time-domain simulations of the same structure. The design paves the way for on-chip M-IR multispectral interferometry and provides a promising approach for compact real-time M-IR measurements.