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

TL;DR

This paper introduces a novel hybrid photonic-plasmonic cavity design operating at telecom wavelengths, achieving extremely high Purcell factors by combining a silicon photonic crystal cavity with a gold nanoparticle.

Contribution

The work presents a new hybrid cavity configuration with high Q-factor and small mode volume at telecom wavelengths, enabling large Purcell factors for various optical applications.

Findings

Achieves Purcell factors of approximately 10^7 to 10^8.

Operates at telecom wavelengths with high Q (~10^5).

Provides a platform for enhanced light-matter interactions.

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 {\mu}m. 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 ${\approx} 10^{5}$) and small normalized mode volumes (Vm ${\approx} 10^{-4}$), leading to extremely large Purcell factor values, FP ${\approx} 10^{7}$ - ${10^{8}}$. 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.