Thermal tuning capabilities of semiconductor metasurface resonators

Tomer Lewi, Nikita A. Butakov, Jon A. Schuller

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Metasurfaces exploit optical phase, amplitude, and polarization engineering at subwavelength dimensions to achieve unprecedented control of light. The realization of all dielectric metasurfaces has led to low-loss flat optical elements with functionalities that cannot be achieved with metal elements. However, to reach their ultimate potential, metasurfaces must move beyond static operation and incorporate active tunability and reconfigurable functions. The central challenge is achieving large tunability in subwavelength resonator elements, which requires large optical effects in response to external stimuli. Here we study the thermal tunability of high-index silicon and germanium semiconductor resonators over a large temperature range. We demonstrate thermal tuning of Mie resonances due to the normal positive thermo-optic effect (dn/dT>0) over a wide infrared range. We show that at higher temperatures and longer wavelengths, the sign of the thermo-optic coefficient is reversed, culminating in a negative induced index due to thermal excitation of free carriers. We also demonstrate the tuning of highorder Mie resonances by several linewidths with a temperature swing of ΔT<100 K. Finally, we exploit the large near-infrared thermo-optic coefficient in Si metasurfaces to realize optical switching and tunable metafilters. Open Access.

Original languageEnglish
Pages (from-to)331-338
Number of pages8
JournalNanophotonics
Volume8
Issue number2
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2019 Tomer Lewi et al., published by De Gruyter.

Funding

Acknowledgments: This work was supported by the Air Force Office of Scientific Research, Funder Id: http://dx.doi.org/10.13039/100006831 (FA9550-16-1-0393) and by the UC Office of the President Multi-campus Research Programs and Initiatives (MR-15-328528). Microscopy was performed with support from MRSEC Program of the NSF under award no. DMR 1121053, a member of the NSFfunded Materials Research Facilities Network. Numerical calculations were performed with the support from the Centre for Scientific Computing from the CNSI, MRL: an NSF MRSEC (DMR-1121053), NSF CNS-0960316. N.A.B. acknowledges support from the Department of Defense NDSEG fellowship. Acknowledgments: This work was supported by the Air Force Office of Scientific Research, Funder Id: http://dx. doi.org/10.13039/100006831 (FA9550-16-1-0393) and by the UC Office of the President Multi-campus Research Programs and Initiatives (MR-15-328528). Microscopy was performed with support from MRSEC Program of the NSF under award no. DMR 1121053, a member of the NSF-funded Materials Research Facilities Network. Numerical calculations were performed with the support from the Centre for Scientific Computing from the CNSI, MRL: an NSF MRSEC (DMR-1121053), NSF CNS-0960316. N.A.B. acknowledges support from the Department of Defense NDSEG fellowship.

FundersFunder number
CNSI
NSF MRSECDMR-1121053, CNS-0960316
National Science Foundation
U.S. Department of Defense
Air Force Office of Scientific ResearchFA9550-16-1-0393
Materials Research Science and Engineering Center, Harvard University
Norsk Sykepleierforbund

    Keywords

    • Mie resonators
    • Nanoparticles
    • Reconfigurable metasurfaces
    • Thermal tuning
    • Tunable metasurfaces

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