Low Power and Large Modulation Depth Optical Bistability in an Si Photonic Crystal L3 Cavity

Abstract

Optical bistability with low power and large modulation depth is observed in the silicon 2D photonic crystal 3 defect-long (L3) cavity coupling with a photonic crystal waveguide experimentally. The cavity-waveguide resonator system operates under the critical coupling condition. The triangular line shape of the cavity resonance and the hysteresis loop of the system is observed. The switching contrast is 7.7 dB and the modulation depth is 0.70 at the switching power of −12.1 dBm. A nonlinear coupled mode model is established to analyze the behavior of the cavity, and numerical simulation results are in good agreement with the experiment results.

Optical Bistability in Nanosilicon with Record Low Q-Factor

“…In this work, we theoretically and experimentally demonstrate optical bistability in a amorphous silicon Mie resonator with the Q -factor of ∼4, and the volume size of ∼10 –3 μm 3 , which are both significantly smaller compared with other representative silicon-based bistable devices made with photonic crystals − or ring cavities, ,,− as shown in the comparison chart of Figure c (see Supporting Information Table S1 for more detailed comparison). We established a photothermal model that explains the emergence of optical bistability, whose underlying mechanism is temperature-dependent nonlinear absorption due to the interplay between Mie resonance and thermo-optical effect, as explained in the following.…”

“…(b) Comparison between silicon ring resonator and our Mie resonator, for the Q -factor ( Q ), the effective nonlinear coefficient ( n 2 ) and footprint size of the structure ( L ). (c) Comparison of resonance Q -factor and normalized footprint over resonant wavelength ( L /λ) for various silicon-based bistable resonators: photonic crystals (orange), ring resonators (blue) and our Mie resonator. ,,− …”

Instantaneous Microwave Frequency Measurement Based on Two Cascaded Photonic Crystal Nanocavities

“…To theoretically research the transmission spectrum of the PC nanocavity, Fig. 2(a) shows the PC transmission spectra which are simulated by utilizing the above equations and the nonlinear coupled mode models [26]. The parameter τv and the cavity resonant wavelength are set to 0.6 ns and 1551.532 nm, respectively.…”

Theoretical research of gas sensing method based on photonic crystal cavity and fiber loop ring-down technique

“…In recent years, photonic crystal (PC), which possesses the unique property of guiding and manipulating light at micro-nano dimension, has become a prominent candidate for realizing miniaturized optical sensors [4]. In particular, PC cavity exhibits strong field confinement and has long photon lifetime [5]. These characteristics give rise to an optical mode with a resonant wavelength that is highly sensitive to local changes of its surrounding mediums, and make PC cavity a promising building block of high-sensitive sensors [6][7][8][9][10][11].…”