Fabrication and characterization of shape- and topology-optimized optical cavities with deep sub-wavelength confinement for interfacing with colloidal quantum dots

Mohammad Abutoama*, Rasmus Ellebæk Christiansen*, Adrian Holm Dubré, Meng Xiong, Jesper Mørk, Philip Trøst Kristensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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 approximately 4.5λ x 4.5λ , which feature gaps on the order of 10 nm and a theoretical mode volume in the gap center below0.1 (λ/2nair)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 and reveal an interesting interplay of two spectrally adjacent modes. The results corroborate the potential of the 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.
Original languageEnglish
Article number113038
JournalOptics and Laser Technology
Volume190
Number of pages8
ISSN0030-3992
DOIs
Publication statusPublished - 2025

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