An All-Dielectric Polaritonic Metasurface with a Giant Nonlinear Optical Response
Year: 2022
Type: article
Abstract: Enhancing the efficiency of second-harmonic generation using all-dielectric metasurfaces to date has mostly focused on electromagnetic engineering of optical modes in the meta-atom. Further advances in nonlinear conversion efficiencies can be gained by engineering the material nonlinearities at the nanoscale, however this cannot be achieved using conventional materials. Semiconductor heterostructures that support resonant nonlinearities using quantum engineered intersubband transitions can provide this new degree of freedom. By simultaneously optimizing the heterostructures and meta-atoms, we experimentally realize an all-dielectric polaritonic metasurface with a maximum second-harmonic generation power conversion factor of 0.5 mW/W 2 and power conversion efficiencies of 0.015% at nominal pump intensities of 11 kW/cm 2 . These conversion efficiencies are higher than the record values reported to date in all-dielectric nonlinear metasurfaces but with 3 orders of magnitude lower pump power. Our results therefore open a new direction for designing efficient nonlinear all-dielectric metasurfaces for new classical and quantum light sources.
Source: Nano Letters
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, Center for Integrated Nanotechnologies, Dipartimenti di Eccellenza, Ministero dell’Istruzione, dell’Università e della Ricerca, Università degli Studi di Padova, Technische Universität München, Defense Advanced Research Projects Agency, Office of Science, National Nuclear Security Administration, Basic Energy Sciences, Sandia National Laboratories, Division of Materials Sciences and Engineering
OpenAlex ID: W4206646833