Transient guided-mode resonance metasurfaces with phase-transition materials

Year: 2023

Authors: De Ceglia D., Gandolfi M., Vincenti MA., Tognazzi A., Franceschini P., Cino AC., Ambrosio G., Baratto C., Li BH., Camacho-Morales R., Neshev DN., De Angelis C.

Autors Affiliation: Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; CNR, Ist Nazl Ott, Via Branze 45, I-25123 Brescia, Italy; Univ Palermo, Dept Engn, Viale Sci Ed 9, I-90128 Palermo, Italy; Australian Natl Univ, ARC Ctr Excellence Transformat Meta Opt Syst TMOS, Dept Elect Mat Engn, Res Sch Phys, Canberra, ACT 2601, Australia.

Abstract: We investigate transient, photo-thermally induced meta -surface effects in a planar thin-film multilayer based on a phase-transition material. Illumination of a properly designed multilayer with two obliquely incident and phase -coherent pulsed pumps induces a transient and reversible temperature pattern in the phase-transition layer. The deep periodic modulation of the refractive index, caused by the interfering pumps, produces a transient Fano-like spec-tral feature associated with a guided-mode resonance. A coupled opto-thermal model is employed to analyze the temporal dynamics of the transient metasurface and to evaluate its speed and modulation capabilities. Using near -infrared pump pulses with peak intensities of the order of 100 MW/cm2 and duration of a few picoseconds, we find that the characteristic time scale of the transient metasurface is of the order of nanoseconds. Our results indicate that induc-ing transient metasurface effects in films of phase-transition materials can lead to new opportunities for dynamic control of quality (Q)-factor in photonic resonances, and for light modulation and switching. (c) 2023 Optica Publishing Group

Journal/Review: OPTICS LETTERS

Volume: 48 (11)      Pages from: 2961  to: 2964

More Information: Funding. North Atlantic Treaty Organization (SPS G5850); Australian Research Council, Centres of Excellence Program, ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS) (CE200100010).
KeyWords: Grating Spectroscopy; Dynamics
DOI: 10.1364/OL.486733

ImpactFactor: 3.100
Citations: 5
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24
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