Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201701346
Keywords
metamaterials; mid-infrared; phase change materials; surface plasmon resonance; tunable
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Funding
- Singapore China Joint Research Program (JRP) through International Science & Technology Cooperation Program of China [2015DFG12630]
- Singapore Science & Engineering Research Council (SERC) [1520203155]
- Program for Liaoning Excellent Talents in University [LJQ2015021]
- SUTD President's Graduate Fellowship
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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.
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