Experimental study demonstrates deterministic photorefractive resonance tuning in a diamond nanocavity, indicating pathways for diamond-based electro-optic modulators.
Key Points
To achieve deterministic in situ resonance frequency tuning in single-crystal diamond photonic crystal nanocavities via light-induced nonlinear optical effects.
Coupled optical fields into a single-crystal diamond photonic crystal nanocavity to generate internal third-harmonic light.
Measured cavity resonance frequency shifts, fractional refractive index variations, and post-excitation relaxation dynamics over tens of hours.
Induced a resonance frequency blue-shift of 20.2 (2) GHz, successfully exceeding the cavity linewidth.
Produced a fractional change in refractive index of -1.05 (1) × 10⁻⁴ that relaxed over several tens of hours.
Demonstrated that the second-order nonlinear response arises from localized electric fields generated by charged crystal defects.