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Proceedings Article

Widely tunable infrared semiconductor Mie resonators (Conference Presentation)

[+] Author Affiliations
Tomer Lewi, Prasad P. Iyer, Nikita A. Butakov, Alexander A. Mikhailovsky, Jon A. Schuller

Univ. of California, Santa Barbara (United States)

Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99180S (November 9, 2016); doi:10.1117/12.2237905
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From Conference Volume 9918

  • Metamaterials, Metadevices, and Metasystems 2016
  • Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev
  • San Diego, California, United States | August 28, 2016

abstract

Optical antenna metasurfaces have attracted substantial attention in recent years, as they may enable new classes of planar optical elements. However, actively tuning nanoantenna resonances, whether dielectric or plasmonic, remains an unresolved challenge. In this work, we investigate tuning mid-infrared (MIR) Mie resonances in semiconductor subwavelength particles by directly modulating the permittivity with free charge carriers. Using femtosecond laser ablation, 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 first demonstrate size-dependent Si and Ge Mie resonances spanning the entire mid-infrared (2-16 μm) spectral range. We subsequently show doping-dependent resonance frequency shifts that follow simple Drude models. Taking advantage of the large doping dependence of Si and Ge MIR permittivities, we demonstrate a huge tunability of Mie resonance wavelengths (up to ~ 9 μm) over a broad 2-16 μm MIR range. This tuning range corresponds to changes of permittivity as large as 30 within a single material system, culminating in the emergence of plasmonic modes at high carrier densities and long wavelengths. We also demonstrate dynamic tuning of intrinsic semiconductor antennas using thermo-optic effects. These findings demonstrate the potential for actively tuning infrared Mie resonances, thus providing an excellent platform for tunable metamaterials. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Tomer Lewi ; Prasad P. Iyer ; Nikita A. Butakov ; Alexander A. Mikhailovsky and Jon A. Schuller
" Widely tunable infrared semiconductor Mie resonators (Conference Presentation) ", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99180S (November 9, 2016); doi:10.1117/12.2237905; http://dx.doi.org/10.1117/12.2237905


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