研究目的
Demonstrating a programmable photonic molecule with two distinct energy levels using coupled lithium niobate microring resonators and controlling it by external microwave excitation to enable coherent and dynamic control of the frequency, amplitude, and phase of photons.
研究成果
The demonstration of coherent and dynamic control of a two-level photonic molecule with microwave fields and on-demand photon storage and retrieval opens a path to a new form of control over photons. These results represent the initial step towards integrated electro-optic coherent manipulation of photonic states and energies, with potential applications in signal processing and quantum photonics.
研究不足
The optical lifetime of the two-level system is much shorter than the coherence time of the laser, which limits the phase coherence time of the two energy levels obtained in the measurement. Additionally, the system's performance is constrained by the delay–bandwidth limit, which affects the controllable write and read of light into a resonator from an external waveguide.
1：Experimental Design and Method Selection:
The experiment involves creating a photonic molecule with two distinct energy levels using coupled lithium niobate microring resonators. The system is controlled by external microwave excitation to demonstrate coherent control over the frequency and phase of light.
2：Sample Selection and Data Sources:
The samples are fabricated on a single-crystalline thin-film lithium niobate layer bonded to a silicon handle wafer. Optical transmission is measured using a tunable telecom-wavelength laser.
3：List of Experimental Equipment and Materials:
The setup includes a tunable telecom wavelength laser (SANTEC TSL510), arbitrary waveform generator (TEKTRONIX AWG70001A), electrical amplifiers, and a 12-GHz photodiode (Newport 1544A).
4：Experimental Procedures and Operational Workflow:
The experiment involves fabricating devices using standard electron-beam lithography, transferring patterns into the lithium niobate layer, and depositing metals. The light from the laser is launched into the lithium niobate waveguides, and microwave control signals are generated and amplified before being sent to the system.
5：Data Analysis Methods:
The electric field amplitude in the symmetric mode is measured by interfering the light out-coupled from the double-ring system with the pump light in the optical waveguide. The interference produces a homodyne signal that is analyzed.
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