Thermally tuned resonances in chalcogenide glass dielectric metasurfaces

Jesse A. Frantz; Robel Y. Bekele; Anthony Clabeau; Jason D. Myers; Vinh Nguyen; Natalia Litchinitser; Jasbinder S. Sanghera

doi:10.1117/12.2548466

2 March 2020 Thermally tuned resonances in chalcogenide glass dielectric metasurfaces

Jesse A. Frantz, Robel Y. Bekele, Anthony Clabeau, Jason D. Myers, Vinh Nguyen, Natalia Litchinitser, Jasbinder S. Sanghera

Author Affiliations +

Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 1128701 (2020) https://doi.org/10.1117/12.2548466
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

A common challenge in metastructure fabrication is precisely tuning of the frequency of a device’s resonance. Slight variations in device dimensions or material properties can lead to a deviation in resonance frequency in comparison to design. We present a method of tuning a dielectric metastructure’s resonance by thermally adjusting the refractive index of a chalcogenide glass (ChG) material. Several characteristics of ChGs make them good candidates for use in dielectric metastructures. They exhibit high linear refractive indices, enabling high index contrast devices; they have large optical nonlinearities, making them useful for tunable devices and nonlinear frequency conversion; and they have wide transmission windows extending from the visible through the long-wave infrared. Recently, we have carried out extensive characterization of the index tuning of arsenic selenide (As₂Se₃) ChG thin films and observed refractive index changes larger than 0.1 in some cases. We use this refractive index change to permanently shift the resonance of a Fabry-Perot filter and the cutoff wavelength for a Bragg reflector. We then demonstrate thermal tuning to shift resonance positions for a metasurface (MS). We compare finite element modeling results with measurement results and show good agreement. This tuning mechanism has potential for use in MS devices where a precise resonance frequency is required.

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Jesse A. Frantz, Robel Y. Bekele, Anthony Clabeau, Jason D. Myers, Vinh Nguyen, Natalia Litchinitser, and Jasbinder S. Sanghera "Thermally tuned resonances in chalcogenide glass dielectric metasurfaces", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 1128701 (2 March 2020); https://doi.org/10.1117/12.2548466

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