The ability of a naturally hyperbolic van der Waals material α-MoO3 to sustain hyperbolic phonon-polaritons allows extreme localization of the mid-infrared electromagnetic field on a subwavelength scale. We propose periodic nanohole arrays in exfoliated α-MoO3 nanoflakes to tune the wavelength of phonon-polariton resonances. We report on the optical properties of α-MoO3 nanohole arrays and their dependence on their geometry. Results have been confirmed using the finite-difference time-domain simulations and near-field mapping of phonon-polaritonic modes. We observe an unusual behavior of the transmission spectra in the fundamental absorption band, where the phononic absorption can be almost entirely alleviated.
We discuss our recent results in nanophotonic properties of engineered naturally hyperbolic van der Waals materials. We thermomechanically control thin MoO3 flakes to tune their crystallographic and phonon-polaritonic properties. We show induction of an irreversible strain of up to -2.4% and tuning of the phonon-polaritonic dispersion relationship by more than 10%. By patterning a nanohole array in the exfoliated flakes, resonant phonon-polaritonic excitations result in more than an order of magnitude in mid-infrared field enhancement, resulting in a strong experimentally verified near-field response and enhancement of nonlinear optical properties.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.