Fundamental limits for transmission modulation in VO2 metasurfaces

Year: 2023

Authors: Li BH., Camacho-Morales R., Li N., Tognazzi A., Gandolfi M., De Ceglia D., De Angelis C., Sukhorukov AA., Neshev DN.

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

Abstract: The interest in dynamic modulation of light by ultra-thin materials exhibiting insulator-metal phase transition, such as VO2, has rapidly grown due to the myriad industrial applications, including smart windows and optical limiters. However, for applications in the telecommunication spectral band, the light modulation through a thin VO2 film is low due to the presence of strong material loss. Here, we demonstrate tailored nanostructuring of VO2 to dramatically enhance its transmission modulation, reaching a value as high as 0.73, which is 2 times larger than the previous modulation achieved. The resulting designs, including free-topology optimization, demonstrate the fundamental limit in acquiring the desired optical performance, including achieving positive or negative transmission contrast. Our results on nanophotonic management of lossy nanostructured films open new opportunities for applications of VO2 metasurfaces. (c) 2022 Chinese Laser Press

Journal/Review: PHOTONICS RESEARCH

Volume: 11 (1)      Pages from: B40  to: B49

More Information: Centre of Excellence for Transformative Meta Optical Systems ( TMOS), Australian Research Council (CE20010001); North Atlantic Treaty Organization (G5850-OPTIMIST); Ministero dellapos; Universita e della Ricerca (2020EY2LJT_002).
KeyWords: Phase-transition
DOI: 10.1364/PRJ.474328

Citations: 15
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