Waveguides, resonators and their coupled elements in photonic crystal slabs

TLDR

High‑Q, small‑volume photonic‑crystal slab resonators were realized through appropriate design. The study demonstrated low‑loss (~1 dB/mm) photonic‑band‑gap waveguides with large group delay (>100 ps), high‑Q small‑volume resonators, and various coupled waveguide–resonator devices such as 2‑port resonant‑tunneling transmission, 4‑port slow‑light channel‑drop, and 3‑port resonant‑tunneling channel‑drop devices.

Abstract

The design, fabrication, and measurement of photonic-band-gap (PBG) waveguides, resonators and their coupled elements in two-dimensional photonic crystal (PhC) slabs have been investigated. We have studied various loss mechanisms in PBG waveguides and have achieved a very low propagation loss (~1 dB/mm). For these waveguides, we have observed a large group delay (>100 ps) by time-domain measurement. As regards PBG resonators, we realize very high-Q and small volume resonators in PhC slabs by appropriate design. Finally, we demonstrate various forms of coupled elements of waveguides and resonators: 2-port resonant-tunneling transmission devices, 4-port channel-drop devices using the slow light mode, and 3-port channel-drop devices using the resonant-tunneling process.