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Precision Tailoring Quasi-BIC Resonance of a-Si:H Metasurfaces

ORCID
0000-0001-6537-4853
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Kuppadakkath, Athira;
ORCID
0000-0003-1090-6108
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Barreda, Ángela;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Ghazaryan, Lilit;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Bucher, Tobias;
Affiliation
Research School of Physics, Australian National University, Canberra, ACT 2601, Australia;(K.K.);(D.C.)
Koshelev, Kirill;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Pertsch, Thomas;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Szeghalmi, Adriana;
Affiliation
Research School of Physics, Australian National University, Canberra, ACT 2601, Australia;(K.K.);(D.C.)
Choi, Duk;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Staude, Isabelle;
Affiliation
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany;(A.K.);(Á.B.);(L.G.);(T.B.);(T.P.);(A.S.);(I.S.)
Eilenberger, Falk

The capability of tailoring the resonance wavelength of metasurfaces is important as it can alleviate the manufacturing precision required to produce the exact structure according to the design of the nanoresonators. Tuning of Fano resonances by applying heat has been theoretically predicted in the case of silicon metasurfaces. Here, we experimentally demonstrate the permanent tailoring of quasi-bound states in the continuum (quasi-BIC) resonance wavelength in an a-Si:H metasurface and quantitatively analyze the modification in the Q -factor with gradual heating. A gradual increment in temperature leads to a spectral shift in the resonance wavelength. With the support of ellipsometry measurements, the spectral shift resulting from the short-duration (ten minutes) heating is identified to be due to refractive index variations in the material rather than a geometric effect or amorphous/polycrystalline phase transition. In the case of quasi-BIC modes in the near-infrared, resonance wavelength could be adjusted from T = 350 °C to T = 550 °C without affecting the Q -factor considerably. Apart from the temperature-induced resonance trimming, large Q -factors can be attained at the highest analyzed temperature (T = 700 °C) in the near-infrared quasi-BIC modes. Resonance tailoring is just one of the possible applications of our results. We expect that our study is also insightful in the design of a-Si:H metasurfaces where large Q -factors are required at high temperatures.

Category

Editor:
Zhu, Weiren; Xiao, Fajun
Published in:
Nanomaterials  
Vol. 13, No. 11 (05.06.2023)
Volume:
13
No.:
11
Date Issued:
05.06.2023
DOI:
10.3390/nano13111810
Language:
English
Type of Resource:
Text
Keywords:
quasi-BIC; dielectric metasurface; tailoring; Q -factor
Subject of DNB:
610 Medical sciences Medicine

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