Higher-order optical resonance node detection of integrated disk microresonator

TL;DR

This paper demonstrates a method for detecting higher-order optical resonance nodes in integrated disk microresonators, enabling high-resolution mode profile measurements with potential for robust optical sensing.

Contribution

It introduces a novel approach to detect higher-order whispering gallery modes in disk microresonators using through port coupling, enhancing sensing capabilities.

Findings

Successful detection of second-order modes with node at maximum energy point

High-resolution optical mode profile measurement achieved

Potential for temperature-independent optical sensing demonstrated

Abstract

We have demonstrated higher-order optical resonance node detection by using an integrated disk microresonator from through port of the coupling bus waveguide. In addition to the fundamental mode, the disk resonator has higher-order whispering gallery modes. The excited second-order higher-order mode has a node at the position where the electromagnetic energy of the fundamental mode is close to a maximum. This high resolution measurement of optical resonance mode profile has a variety of applications for optical sensing and detection. The self-referencing characteristics of the two optical resonance modes have potential to achieve optical detection independent of external perturbation, such as temperature change.