Deformed Microcavity for Far Field Biosensing

TL;DR

This paper introduces a novel deformed microcavity biosensor that leverages broken rotational symmetry to achieve ultra-sensitive detection of particle binding locations and enables far-field detection of single particles or molecules.

Contribution

The work presents a new design for microcavity biosensors that enhances sensitivity and allows for far-field detection through directional emission.

Findings

Sensor sensitivity depends on particle position on the cavity boundary

Deformed cavity exhibits mode splitting related to particle location

Directional emission enables single-molecule detection in the far field

Abstract

Here we demonstrate a new concept for designing an ultra-sensitive deformed cavity biosensor. Owning to the breaking of rotational symmetry, the field distribution is not uniform along the cavity boundary and results in the dependence of spectra shift and mode splitting on the position of a scatter. In this case, the deformed cavity sensor can be extremely sensitive to the location of particle binding on the cavity boundary. Moreover, the directional emission from the deformed microcavity provides a possibility to detect a single particle or molecule in the far field.