Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7846172 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2018 | 18 Pages |
Abstract
Chirality is a property of certain molecules, materials or artificial nanostructures, which enables them to interact with the spin angular momentum of an incident light. This provides a different optical response, depending on the incident polarization, which gives rise to chiral optical spectroscopies. However, low-detection limits require an enhanced chiral light-matter interaction. Here, we propose a novel type of resonant chiral optical nanoantenna based on high-index dielectric (Cu2O) spherical nanoparticles arranged in a trimer geometry. We demonstrate both numerically and experimentally that this trimer nanoantenna exhibits resonantly enhanced optical dichroism and light hotspots, which are associated with this geometry. Moreover, we apply near-field optical microscopy to measure the near-field peculiarities of the proposed nanoantenna. The ability of changing the nanoantenna near field scattering by varying the light polarization is shown.
Related Topics
Physical Sciences and Engineering
Chemistry
Spectroscopy
Authors
Kaleem Ullah, Braulio Garcia-Camara, Muhammad Habib, Xuefeng Liu, Alex Krasnok, Sergey Lepeshov, Jingjing Hao, Juan Liu, N. P Yadav,