Fabrication and characterization of shape- and topology-optimized optical cavities with deep sub-wavelength confinement for interfacing with colloidal quantum dots
Abstract
We employ a combined shape- and topology-optimization strategy to design manufacturable two-dimensional photonic crystal-based optical nanocavities that confine light to length scales well below the resonance wavelength. We present details of the design strategy as well as scanning electron micrographs of the fabricated indium phosphide cavities with a compact footprint of ~"4.5{\lambda}*4.5{\lambda}" , which feature gaps on the order of 10 nm and theoretical mode volumes in the gap center below (0.1 ({\lambda}/2n_air))^3. Subsequent optical characterization of the far-field emission as well as Purcell-enhanced photoluminescence from the cavities with and without spin-coated colloidal quantum dots are compared to numerical simulations. The results corroborate the potential of the design strategy and fabrication process for ensuring high yield and reliable performance as well as the viability of the material platform for exploring light-matter interaction with colloidal QDs.
Keywords
Cite
@article{arxiv.2502.00936,
title = {Fabrication and characterization of shape- and topology-optimized optical cavities with deep sub-wavelength confinement for interfacing with colloidal quantum dots},
author = {Mohammad Abutoama and Rasmus Ellebæk Christiansen and Adrian Holm Dubré and Meng Xiong and Jesper Mørk and Philip Trøst Kristensen},
journal= {arXiv preprint arXiv:2502.00936},
year = {2025}
}