Low mode volume slotted photonic crystal single nanobeam cavity

TL;DR

This paper introduces a silicon-based slotted photonic crystal nanobeam cavity with ultra-small mode volume and high quality factor, enabling enhanced light-matter interactions for various optical applications.

Contribution

The work demonstrates a novel slotted nanobeam cavity design with significantly reduced mode volume and high quality factor, advancing photonic device performance.

Findings

Mode volume reduced to ~0.025(bb/bn)^3

Achieved quality factors near 10^4

Potential for enhanced light-matter interactions

Abstract

We present and experimentally demonstrate a slotted photonic crystal single nanobeam cavity in silicon. The slot geometry is exploited to achieve ultra-small effective mode volumes, ~0.025({\lambda}/n)^3, more than an order of magnitude smaller than traditional nanobeam cavities. A continuous slot and a tapered photonic crystal design are implemented to achieve experimental quality factors near 10^4. This device structure offers a unique platform for achieving enhanced light-matter interactions and could be used to benefit a variety of applications including non-linear optics, cavity quantum electro-dynamics, sensing, optical modulation, and nano-optomechanics.