Abstract

Optical resonators with high-quality factors ($Q$-factor) constitute the main building block for many photonic devices capitalizing on light–matter interactions, ranging from light emitters to biochemical sensors. While a high $Q$-factor enhances light–matter interactions, it also limits the device operation bandwidth. Here we propose and numerically analyze a generic coupling scheme to overcome the apparent trade-off. By using an orthogonal grating, broadband optical coupling into high-$Q$ cavities of diverse geometric configurations can be achieved. As an example, the approach is applied to demonstrate over a 28-fold optical absorption enhancement across a 150 nm band around 900 nm wavelength in single-layer graphene embedded inside a Fabry–Perot cavity.

© 2015 Optical Society of America

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