Hybrid photonic-plasmonic cavity design for very large Purcell factors at telecom wavelengths

2022/04/11 by Ángela Barreda, Barreda, Angela, Laura Mercadé +7
Engineering · Physics and Astronomy · #Photonic and Optical Devices #Plasmonic and Surface Plasmon Research #Photonic Crystals and Applications

paper · pdf · doi:10.48550/arxiv.2204.05241

Abstract

Hybrid photonic-plasmonic cavities can be tailored to display high Q-factors and extremely small mode volumes simultaneously, which results in large values of the Purcell factor, FP. Amongst the different hybrid configurations, those based on a nanoparticle-on-a-mirror (NPoM) plasmonic cavity provide one of the lowest mode volumes, though so far their operation has been constrained to wavelengths below 1 μm. Here, we propose a hybrid configuration consisting of a silicon photonic crystal cavity with a slot at its center in which a gold nanoparticle is introduced. This hybrid system operates at telecom wavelengths and provides high Q-factor values (Q ≈ 10⁵) and small normalized mode volumes (Vm ≈ 10^-4), leading to extremely large Purcell factor values, FP ≈ 10⁷ - 10⁸. The proposed cavity could be used in different applications such as molecular optomechanics, bio- and chemo-sensing, all-optical signal processing or enhanced Raman spectroscopy in the relevant telecom wavelength regime.

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