Amorphous Selenium Mie Resonators for Infrared Meta-Optics
Abstract
Applying direct growth and deposition of optical surfaces holds great promise for the advancement of future nanophotonic technologies. Here, we report on a chemical vapor deposition (CVD) technique for depositing amorphous selenium (a-Se) spheres by desorption of selenium from Bi2Se3 and re-adsorption on the substrate. We utilize this process to grow scalable, large area Se spheres on several substrates and characterize their Mie-resonant response in the mid-infrared (MIR) spectral range. We demonstrate size-tunable Mie resonances spanning the 2-16 um spectral range, for single isolated resonators and large area ensembles, respectively. We further demonstrate strong absorption dips of up to 90% in ensembles of particles in a broad MIR range. Finally, we show that ultra-high-Q resonances arise in the case where Se Mie-resonators are coupled to low-loss epsilon-near-zero (ENZ) substrates. These findings demonstrate the enabling potential of amorphous Selenium as a versatile and tunable nanophotonic material that may open up avenues for on-chip MIR spectroscopy, chemical sensing, spectral imaging and large area metasurface fabrication.
Keywords
Cite
@article{arxiv.2112.14989,
title = {Amorphous Selenium Mie Resonators for Infrared Meta-Optics},
author = {Danveer Singh and Michal Poplinger and Avraham Twitto and Rafi Snitkoff and Pilkhaz Nanikashvili and Ori Azolay and Adi Levi and Chen Stern and Gili Cohen Taguri and Asaf Albo and Doron Naveh and Tomer Lewi},
journal= {arXiv preprint arXiv:2112.14989},
year = {2022}
}