Widely Tunable Infrared Antennas Using Free Carrier Refraction

We demonstrate tuning of infrared Mie resonances by varying the carrier concentration in doped semiconductor antennas. We fabricate spherical silicon and germanium particles of varying sizes and doping concentrations. Single-particle infrared spectra reveal electric and magnetic dipole, quadrupole,...

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Bibliographic Details
Published inNano letters Vol. 15; no. 12; pp. 8188 - 8193
Main Authors Lewi, Tomer, Iyer, Prasad P, Butakov, Nikita A, Mikhailovsky, Alexander A, Schuller, Jon A
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 09.12.2015
Subjects
semiconductor nanoparticles
Mie resonators
free carrier refraction
silicon photonics
tunable metamaterials
Optical antennas
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Summary:We demonstrate tuning of infrared Mie resonances by varying the carrier concentration in doped semiconductor antennas. We fabricate spherical silicon and germanium particles of varying sizes and doping concentrations. Single-particle infrared spectra reveal electric and magnetic dipole, quadrupole, and hexapole resonances. We subsequently demonstrate doping-dependent frequency shifts that follow simple Drude models, culminating in the emergence of plasmonic resonances at high doping levels and long wavelengths. These findings demonstrate the potential for actively tuning infrared Mie resonances by optically or electrically modulating charge carrier densities, thus providing an excellent platform for tunable metamaterials.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b03679