Metallic nanoparticle on micro ring resonator for bio optical detection and sensing

TL;DR

This paper explores how metallic gold nanoparticles affect micro ring resonators, revealing unique blue shifts and dependencies useful for bio optical detection and sensing applications.

Contribution

It demonstrates the distinct optical effects of gold nanoparticles on micro ring resonators, including the blue shift and port intensity dependence, advancing bio sensing technology.

Findings

Gold nanoparticles cause a blue shift in resonance wavelength.

Drop port intensity depends on nanoparticle number and size.

The study discusses the correlation between penetration depth and resonance mode.

Abstract

We have investigated the unique effects of metallic nanoparticle on the ring resonator, especially multiple Au nanoparticles on the micro ring resonator with the 4-port configuration on chip. For the Au nanoparticle, because it has smaller real refractive index than air and large absorption refractive index, we found that there is a blue shift for the ring resonance wavelength, instead of red shift normally observed for dielectric nanoparticles. The drop port intensity is strongly dependent on both number and size of nanoparticles, while relatively independent on position of nanoparticles. The correlation between the penetration depth of Au and the resonance mode evanescent tail is also discussed to reveal the unique properties of Au nanoparticle to be used for detection, sensing and nano medicine.