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Title: All-optical tuning of symmetry protected quasi bound states in the continuum

Abstract

We demonstrate all-optical switching of high quality factor quasibound states in the continuum resonances in broken symmetry GaAs metasurfaces. By slightly breaking the symmetry of the GaAs nanoresonators, we enable leakage of symmetry protected bound states in the continuum (BICs) to free space that results in sharp spectral resonances with high quality factors of ~500. We tune the resulting quasi-BIC resonances with ultrafast optical pumping at 800 nm and observe a 10 nm spectral blue shift of the resonance with pump fluences of less than 100 μJ cm -2. The spectral shift is achieved in an ultrafast time scale (<2.5 ps) and is caused by a shift in the refractive index mediated by the injection of free carriers into the GaAs resonators. An absolute reflectance change of 0.31 is measured with 150 μJ cm -2. Our results demonstrate a proof-of-concept that these broken symmetry metasurfaces can be modulated or switched at ultrafast switching speeds with higher contrast at low optical fluences (<100 μJ cm-2) than conventional Mie-metasurfaces.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [2];  [2]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1574697
Alternate Identifier(s):
OSTI ID: 1567928
Report Number(s):
SAND-2019-11154J
Journal ID: ISSN 0003-6951; 679777
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Karl, Nicholas, Vabishchevich, Polina P., Liu, Sheng, Sinclair, Michael B., Keeler, Gordon A., Peake, Gregory M., and Brener, Igal. All-optical tuning of symmetry protected quasi bound states in the continuum. United States: N. p., 2019. Web. doi:10.1063/1.5116031.
Karl, Nicholas, Vabishchevich, Polina P., Liu, Sheng, Sinclair, Michael B., Keeler, Gordon A., Peake, Gregory M., & Brener, Igal. All-optical tuning of symmetry protected quasi bound states in the continuum. United States. doi:10.1063/1.5116031.
Karl, Nicholas, Vabishchevich, Polina P., Liu, Sheng, Sinclair, Michael B., Keeler, Gordon A., Peake, Gregory M., and Brener, Igal. Tue . "All-optical tuning of symmetry protected quasi bound states in the continuum". United States. doi:10.1063/1.5116031.
@article{osti_1574697,
title = {All-optical tuning of symmetry protected quasi bound states in the continuum},
author = {Karl, Nicholas and Vabishchevich, Polina P. and Liu, Sheng and Sinclair, Michael B. and Keeler, Gordon A. and Peake, Gregory M. and Brener, Igal},
abstractNote = {We demonstrate all-optical switching of high quality factor quasibound states in the continuum resonances in broken symmetry GaAs metasurfaces. By slightly breaking the symmetry of the GaAs nanoresonators, we enable leakage of symmetry protected bound states in the continuum (BICs) to free space that results in sharp spectral resonances with high quality factors of ~500. We tune the resulting quasi-BIC resonances with ultrafast optical pumping at 800 nm and observe a 10 nm spectral blue shift of the resonance with pump fluences of less than 100 μJ cm-2. The spectral shift is achieved in an ultrafast time scale (<2.5 ps) and is caused by a shift in the refractive index mediated by the injection of free carriers into the GaAs resonators. An absolute reflectance change of 0.31 is measured with 150 μJ cm-2. Our results demonstrate a proof-of-concept that these broken symmetry metasurfaces can be modulated or switched at ultrafast switching speeds with higher contrast at low optical fluences (<100 μJ cm-2) than conventional Mie-metasurfaces.},
doi = {10.1063/1.5116031},
journal = {Applied Physics Letters},
number = 14,
volume = 115,
place = {United States},
year = {2019},
month = {10}
}

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