New Cross-Coupled Resonator Induced Shifted Absorption (CRISA) in Double Microring Resonators Using a Cross-Coupling-Structure Technique

• Main Authors: Dingel, Benjamin, Ye, Bo
• Format: text
• Published: Archīum Ateneo 2022
• Subjects: coherent optical effects; coupled resonator-induced absorption; coupled resonator-induced transparency; Coupled resonators; cross-coupled resonator induced shifted absorption; Optics; Physical Sciences and Mathematics; Physics
• Online Access: https://archium.ateneo.edu/physics-faculty-pubs/138; https://doi.org/10.1080/09500340.2022.2159082
• Institution: Ateneo De Manila University

We report, for the first time to the best of our knowledge, a technique that employs ′cross-coupling structure’ in the cascaded microring resonators (MRRs) to bring new optical analogues of quantum coherence phenomena. The new configuration resembles a standard double resonator (SDR) but uses cross-coupled–based directional couplers (DCs) instead of the typical direct-coupled–based DCs. One of its unique features is that it does not exhibit the typical SDR’s signature quantum coherence analogue effects like coupled-resonator induced transparency (CRIT) or coupled-resonator induced absorption (CRIA). On the contrary, it produces a new very narrow reflection dip positioned at single-pass phase shift θ = − π/2 which we refer to as cross-coupled resonator induced shifted absorption (CRISA). We compare extensively CRISA’s characteristics with the CRIT, CRIA, and Autler-Townes splitting (ATS) found in SDR. The technique opens up new configurations with richer optical behaviours that could find potentially still unexplored applications.