Figure - available from: Optics Letters
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Reflection of light in the OMWA. (a) Gaussian control light is incident normally, and the Gaussian signal light is incident with an angle of 11.7 deg ( ${k_x}S = \pi /{2}$ k x S = π / 2 ). Power distributions of the signal light in the OMWA (b) without the control light, and (c), (d) with the control light of 1.31 and 1.795 mW, respectively. (e)–(g) Corresponding $\Delta {n_{{\rm eff}}}$ Δ n e f f distributions in the OMWA.
Source publication
The propagation properties of light in optomechanical waveguide arrays (OMWAs) are studied. Due to the strong mechanical Kerr effect, the optical self-focusing and self-defocusing phenomena can be realized in the arrays of subwavelength dielectric optomechanical waveguides with the milliwatt-level incident powers and micrometer-level lengths. Compa...
Citations
... This deformation changes the effective refractive index (n eff ), and is known as the mechanical Kerr effect (MKE) [14]. The mechanical Kerr coefficient can be several orders of magnitude larger than the conventional optical Kerr coefficient, and due to the strong MKE, the tuning efficiencies of integrated photonic devices can greatly increase [15][16][17][18][19][20][21][22][23]. ...
An all-optical realization scheme of electromagnetically induced transparency (EIT) in a single silicon optomechanical microring resonator is proposed and demonstrated. Due to the strong mechanical Kerr effect and well-designed microring resonator, two modes with a resonant frequency separation of 292 GHz (2.35 nm) can be tuned into resonance when the control power is about 4.3 µW, and the EIT spectrum is achieved. Our work provides a constructive solution for realizing EIT in a single microcavity with a low mode density. Furthermore, this device is fully integrated on-chip and compatible with current complementary metal-oxide semiconductor (CMOS) processing and has great potential in applications such as light storage, optical sensing, and quantum optics.
All-optical control of silicon photonic devices plays a key role in on-chip all-optical computing, switching and signal processing. However, due to the weak intrinsic nonlinear effects of silicon, current integrated devices are limited by high power consumptions. Here, an all-optical controllable optomechanical microring resonator (OMMR) is proposed and fabricated on the silicon platform. Due to the mechanical Kerr effect induced by the optical gradient force (OGF), we realize seamless wavelength tuning over a range of 2.56 nm which is 61% of the free-spectral range, with a high tuning efficiency of 80 GHz/mW. By controlling the pump power, the OMMR indicates three working regions, which are the cutoff region, amplified region and saturate region. Accordingly, this function is similar to a transistor. Furthermore, the dynamic properties of the OMMR are investigated. By analyzing the dynamic responses, we demonstrate that the OMMR is driven by the OGF, rather than other nonlinear effects. The method simplifies the experimental setup, compared with measuring the intrinsic mechanical frequency of the OMMR. This all-silicon device is energy-efficient and compatible with complementary metal-oxide semiconductor (CMOS) processing. We believe that this work is important for on-chip all-optial signal processing and beneficial to futher studies on integrated optomechanics.
This study demonstrates that coupled waveguide networks with quadratic and cubic nonlinearity mediated by a linear waveguide allow for the generation, enhancement and transmission of squeezed light on a single-mode and multi-mode basis. The time evolution of the density matrix could be mapped to the corresponding Fokker–Planck equation of a classical quasiprobability distribution using the positive P representation of the phase space. Using the Langevin stochastic equation, we examine the scenarios where the system functions at varied evanescent coupling profiles, coupled modes interaction, competing nonlinear response and ultimately when the second harmonic generation and self-action Kerr interaction are present or absent. We analyze the behavior of squeezing and how the evolution is affected by the presence of coupled nonlinearity. We show that the interplay of linear and nonlinear effects in coherently driven coupled waveguide networks has the potential to be a valuable source of squeezed light.
