研究目的
To experimentally demonstrate topological waveguiding, refracting, resonating, and routing of valley-polarized photons in integrated circuits.
研究成果
The work extends traditional photonic integrated circuits and devices into the topologically nontrivial regime with demonstration of topologically protected photonic waveguides, microcavities, and beam splitters. Beyond practical applications in robust optical communication and signal processing, the results open the door for various fundamental optical phenomena in topologically nontrivial nanophotonic structures.
研究不足
The study focuses on the demonstration of topological photonic phenomena on an integrated silicon photonic platform, with potential limitations in the scalability and integration with other optoelectronic devices due to the specific design and fabrication requirements of the photonic crystals.
1：Experimental Design and Method Selection:
The study exploits the valley degree of freedom to demonstrate topological photonic phenomena on an integrated silicon photonic platform. It involves the realization of a tightly confined valley kink state at the domain wall between two photonic crystals of different valley topological phases.
2：Sample Selection and Data Sources:
The photonic crystals are designed and fabricated on standard silicon-on-insulator wafers, with a 220-nm silicon device layer on 3-μm-thick buried oxide.
3：List of Experimental Equipment and Materials:
The device patterns were defined by high-resolution electron-beam lithography and transferred to the silicon device layer by plasma dry etching.
4：Experimental Procedures and Operational Workflow:
The transmission spectra of the fabricated devices were measured by coupling light from a tunable semiconductor laser via a single-mode fiber to the on-chip photonic waveguides through an integrated grating coupler. The output signal was measured by a high-sensitivity optical power sensor.
5：Data Analysis Methods:
The energy band diagram and Berry curvature of the bulk states were obtained from 3D simulation in MPB. Other numerical results including the edge-state band diagram, the transmission spectra, and the optical field distributions were obtained from 3D finite-difference time-domain simulation in Lumerical.
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