Dynamic light-driven metasurface: Harnessing quasibound states in the continuum for laser-induced selective crystallization

Anno: 2024

Autori: Gandolfi M., Flores MES., Frantz J., Myers J., Bekele R., Sanghera J., Clabeau A., Litchinitser NM., Vincenti MA.

Affiliazione autori: Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy; CNR, Ist Nazl Ott, Via Branze 45, I-25123 Brescia, Italy; Consorzio Nazl Interuniv Telecomunicazioni CNIT, Viale GP Usberti 181-A Sede Sci Ingn Palazzina 3, I-43124 Parma, Italy; US Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA; Univ Res Fdn, 6411 Ivy Ln 110, Greenbelt, MD 20770 USA; Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA.

Abstract: We present the design of an asymmetric metasurface made of germanium antimony tellurium nanowires that supports quasibound states in the continuum. A fully coupled optothermal model is used to show that, when exposed to brief and intense laser pulses, the metasurface undergoes a partial, geometrically controlled crystallization, thereby inducing an ultrafast dynamic wavelength shift of the quasibound state in the continuum of the order of 350 nm with pump intensities as low as 35 MW/cm2. The proposed approach highlights the potential for controlling nanostructures’ response through laser illumination, opening avenues for applications in dynamic optical modulation and beyond.

Giornale/Rivista: PHYSICAL REVIEW A

Volume: 110 (1)      Da Pagina: 13510-1  A: 13510-10

Maggiori informazioni: M.G. acknowledges the European Union for the financial support through FESR o FSE, PON Ricerca e Innovazione 2014-2020-DM 1062/2021. J.F., J.M., R.B., J.S., and A.C. acknowledge NRL Base Program 6.1 funding. N.M.L. and M.A.V. acknowledge partial funding from NATO SPS Grant No. G5984. M.A.V. also thanks MUR as part of the PRIN 2022 project PILLARS (2022YJ5AZH) . We thank Professor Costantino De Angelis for fruitful discussions.
Parole chiavi: Phase-change Materials; Optics; Nonvolatile
DOI: 10.1103/PhysRevA.110.013510

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