VO<sub>2</sub>–graphene-integrated hBN-based metasurface for bi-tunable phonon-induced transparency and nearly perfect resonant absorption

نویسندگان

چکیده

Abstract A bi-tunable hexagonal boron nitride (hBN)-based metasurface with bi-functional phonon-induced transparency (PIT) and nearly perfect resonant absorption features in the mid-infrared (MIR) range is proposed. The metasurface, that composed of axially symmetric hBN rings, separated from a uniform thin vanadium dioxide (VO 2 ) film SiO spacing layer integrated top graphene sheet. For insulating phase VO (i-VO ), PIT an 80% transmission contrast ratio observed inside reststrahlen (RS) band due to support hyperbolic phonon polaritons. considerably large group delay 9.5 ps up 1.8 THz RIU −1 frequency shift per refractive index unit also achieved for i-VO case. On other hand, it found metallic (m-VO light prohibited peaks are appeared RS hBN. Finally, by integrating hBN-based into sheet on top, tunable PIT-like effect duo hybridization plasmons phonons. This leads modulation depth as high 87% 62% responses. Our findings offer device practical MIR slow-light, sensing, thermal emission applications.

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ژورنال

عنوان ژورنال: Journal of Physics D

سال: 2021

ISSN: ['1361-6463', '0022-3727']

DOI: https://doi.org/10.1088/1361-6463/abecb2