An All-Dielectric Metasurface Coupled with Two-Dimensional Semiconductors for Thermally Tunable Ultra-narrowband Light A
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An All‑Dielectric Metasurface Coupled with Two‑Dimensional Semiconductors for Thermally Tunable Ultra‑narrowband Light Absorption Ebru Buhara1,2 · Amir Ghobadi1,2 · Ekmel Ozbay1,2,3,4 Received: 10 August 2020 / Accepted: 9 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted tremendous attention over the past decades. Due to their unique features such as high mobility and direct bandgap, they are suitable candidate for the optoelectronic devices. However, due to their ultrathin thickness, their optical absorption is quite weak, and therefore, a trapping scheme for strong light- matter interaction is essential to overcome this deficiency. To accomplish strong light absorption, loss-less dielectric-based metasurfaces with ideally no parasitic absorption are excellent choices. Herein, we report an ultra-narrowband thermally tunable all-dielectric metasurface coupled absorber with TMD monolayer. In this proposed structure, high absorption with ultra-narrow full-width-at-half-maximum (FWHM) is achieved. Different design configurations are studied to find the most suitable structure. In the optimized design, an absorptance as high as 0.85 with a FWHM of 3.1 nm is achieved. This structure also shows thermal sensitivity of 0.0096 nm/°C, without the use of any phase change material component. This architecture can be used as a 2D and highly efficient tunable single-color photodetector. The proposed dielectric metasurface can be adopted for other types of 2D and ultrathin semiconductor-based optoelectronics. Keywords Photodetector · Metasurface · Two-dimensional material · Titanium dioxide
Introduction In recent years, two-dimensional (2D) materials such as graphene, hexagonal boron nitride, and transition metal dichalcogenides (TMDCs) have been attractive research topics due to their exotic electrical, optical, and mechanical properties and their suitability for usage in the future 2D electronic and optoelectronics [1–4]. This interest started after the first * Ekmel Ozbay [email protected] Ebru Buhara [email protected] 1
NANOTAM‑Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey
2
Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey
3
Department of Physics, Bilkent University, 06800 Ankara, Turkey
4
UNAM‑Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey
extraction from graphite using the mechanical exfoliation method of graphene, and since then, graphene has become one of the most intensively studied topics in the field of 2D materials [5–8]. Although it attracts tremendous attention and it is used in electronic device development, graphene is an inconvenient substance for digital and optoelectronic applications due to the lack of optical bandgap [9]. This absence caused the focus of the 2D material research to shift to the TMDCs [10–13]. TMDCs are semiconductors in the form of
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