Pseudomagnetic Control of Light Waves in the Electrically Tunable Photonic Crystals with Deformation Engineering

Abstract With the demonstrations of pseudo‐magnetism in optical systems, the pursuits of its practical applications require not only the use of pseudomagnetic fields (PMFs) to create functional optical devices but also a reliable method to manipulate pseudo‐magnetism‐affected light waves. Here, an ultracompact Si‐based cavity formed by triaxially deformed photonic honeycomb lattices is experimentally demonstrated. The triaxial deformation can lead to Landau quantization, showing the possibilities of realizing the localization and resonating of photons with PMFs. Through adopting the Si waveguides for directional coupling, the transmission spectra for the proposed cavities in the photonic integrated circuits are successfully obtained. This opens a novel avenue for highly efficient excitations and detections of Landau‐quantized photonic density of states, totally on chip. Moreover, a linear electrical tunability of −0.018 THz/mW for the pseudo‐magnetism‐induced optical resonant states, fulfilling the manipulation of photons without varying deformations, is verified. The work introduces a mechanism for performing tunable light waves in triaxial deformation‐engineered systems, which enriches the design principles of integrated optical devices.