Dr. Giuseppe Strangi (Case Western Reserve University)
Thin-Film Photonics: Enabling Fano Resonances and Optomechanics
Abstract – In recent years, significant interest has emerged in the inverse design1 of artificial layered heterostructures for photonic applications2. Specifically, the unique optical properties of near-zero permittivity (ENZ) metamaterials have enabled the exploration of novel physical effects and mechanisms. In this presentation, I will delve into how thin film photonics harnesses the potential of Fano resonances3-4 and extreme optomechanics5. By layering metal-dielectric thin films, we can create a distinct type of optical coating that exhibits photonic Fano resonance, referred to as a Fano-resonant optical coating (FROC). We extend the concept of coupled mechanical oscillators to thin-film nanocavities, shedding light on semi-transparent FROCs that can both transmit and reflect the same color, akin to a beam splitter filter. This remarkable property is beyond the capabilities of conventional optical coatings. In the latter part of my presentation, I will discuss recent theoretical and experimental efforts aimed at exploring optomechanics based on epsilon-near-zero materials5.
[1] Lininger, A., Hinczewski, M., & Strangi, G. “General Inverse Design of Layered Thin-Film Materials with Convolutional Neural Networks”. ACS PHOTONICS, 8(12), 3641-3650 (2021)
[2] K. V. Sreekanth, Y. Alapan, M. ElKabbash, U. A. Gurkan, E. Ilker, M. Hinczevski, A. De Luca and G. Strangi NATURE MATERIALS 15, 4 4609 (2016)
[3] ElKabbash, M.; Letsou, T.; Jalil, S. A; Hoffman; Lininger, A. R; Fann, C.; Hinczewski, M.; Strangi, G. and Chunlei, G.; “Fano-resonant ultrathin film optical coatings” NATURE NANOTECHNOLOGY, 16, 4, 440-446 (2021)
[4] ElKabbash, Mohamed; Hoffman, Nathaniel; Lininger, Andrew R; Jalil, Sohail A; Letsou, Theodore; Hinczewski, Michael; Strangi, Giuseppe; Guo, Chunlei; “Fano resonant optical coatings platform for full gamut and high purity structural colors” NATURE COMMUNICATIONS, 14, 1 3960 (2023).
[5] Kiasat, Y., Donato, M.G., Hinczewski, M. Elkabbash, M., Letsou, T., Sajia R., Marago’ O.M., Strangi, G., & Engheta, N. Epsilon-near-zero (ENZ)-based optomechanics. COMMUNICATION PHYSICS 6, 69 (2023)
Bio – Dr. Giuseppe Strangi is Professor of Physics at Case Western Reserve University and holds an Endowed Chair position as Ohio Research Scholar on Surfaces in Advanced Materials. He is affiliated with IAM – Institute for Advanced Materials at CWRU and with CNR – National Research Council, Italy.
https://nanoplasmlab.com/
This is an in-person seminar. If you opt to join via zoom use meeting ID 860 8907 5271 Passcode 046161