Gain enhanced Fano resonance in a coupled photonic crystal cavity-waveguide structure

Abstract

Systems with coupled cavities and waveguides have been demonstrated as optical switches and optical sensors. To optimize the functionalities of these optical devices, Fano resonance with asymmetric and steep spectral line shape has been used. We theoretically propose a coupled photonic crystal cavity-waveguide structure to achieve Fano resonance by placing partially reflecting elements in waveguide. To enhance Fano resonance, optical gain material is introduced into the cavity. As the gain increases, the transmission line shape becomes steepened and the transmissivity can be six times enhanced, giving a large contrast by a small frequency shift. It is prospected that the gain enhanced Fano resonance is very useful for optical switches and optical sensors.

16 pages, 5 figures

References in corpus (4)

• Fano resonance control in a photonic crystal structure and its application to ultrafast switching
• Quantum Interference Induced Photon Blockade in a Coupled Single Quantum Dot-Cavity System
• Ultrafast Optical Switching Using Photonic Molecules in Photonic Crystal Waveguides
• Mode identification of high-quality-factor single-defect nanocavities in quantum dot-embedded photonic crystals