Tunable Single-Mode Output by Optical-Mode Selection

Abstract

The ability to manipulate and select optical modes effectively and accurately is strongly desired to enable single-mode operation. Here, we report an optical system consisting of two directly coupled metal-cladded optical resonators that can realize a single-mode peak through control of the tuning between the resonant wavelengths of the two optical resonators. Additionally, the wavelength of the single-mode peak can be chosen via adjusting the angle of incident light. Furthermore, the linewidth and power of the single-mode output can be controlled completely by the thickness of the resonator guide layer and the angle of incident light. This optical system provides a way to realize optical information processing without the need for complex structures and specific materials.