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High Q optomechanical cavity is demonstrated based on silicon nanobeam structure with mechanical frequency of 4.52GHz. The mechanical Q can reach 24500 with the help of optical spring effect, which is record-high in ambient environment.
We demonstrate an on-chip integrated Cherenkov radiation (CR) emitter, in which the no-threshold CR could be realized and a broadband CR is observed with electron energy of only 0.25–1.4keV.
Optomechanical crystals are combinations of photonic and phononic crystals, which simultaneously control optical and acoustic waves with nanoscale periodic structure and form optomechanical systems with high mechanical frequency and lager photon-phonon interaction.
An integrated photonic reservoir computing based on hierarchical time-multiplexing structure is proposed by numerical simulations. Error rates of 2.2∼6.5% for chaotic time series prediction are achieved with sample rate of 1.3∼0.4Gbps and bandwidth of 40∼10GHz.
A split-nanobeam optomechanical crystal cavity is proposed. By adjusting the split width, an ultra-small effective motion mass as small as 5.2fg is realized with a high mechanical frequency of 7.55GHz.
A “cobweb” structure is demonstrated to serve as the gratings for the emission of optical vortices, based on a microring cavity. The scattered optical vortices with topological charges of −4 ∼ 4 were experimentally obtained.
The bending loss of silicon slot waveguide is experimentally investigated at 1064 nm and the measured value is 4.1 dB/180° with radius of 15 µm. Consequently, tunable micro-rings are demonstrated based on such slot waveguides.
Broadband 1×4 thermo-optic switch is demonstrated based on four W2 photonic crystal waveguides with footprint of 17.6 µm×8 µm. Extinction ratio larger than 15dB is obtained over the bandwidth of 15±1 nm in each channel.
An optomechanical crystal nanobeam cavity with high optomechanical coupling rate is proposed and fabricated. Only by adjusting the radius of the air holes, the cavity realizes an optomechanical coupling rate as high as 1.24 MHz.
A hetero optomechanical crystal nanobeam cavity with high mechanical frequency of 5.88 GHz is proposed. By enhancing the overlap between optical and strain field, an optomechanical coupling rate as high as 1.31 MHz is achieved.
InP heterostructure photonic crystal waveguide (PCW) is fabricated by ICP etching with high-aspect-ratio of 45. Structure-dependent transmission-dip about 17dB and micro-photoluminescence linewidth of only 73nm are demonstrated in a 17μm-long heterostructure PCW.
Thermo-optic switch based on W1 photonic crystal waveguide is demonstrated, high extinction ratio of 23.5 dB has been experimentally achieved under a switching power as low as 8.9 mW while the device is only 16.8-μm-long.
Through weighted multi-beam interference in silicon waveguides, identifying the topology charge of optical angular momentum (OAM) beams is experimentally demonstrated. Based on this approach, an OAM receiver can be obtained for detecting and decoding.
Deep etching for InP/InGaAsP based slotted photonic crystal by inductively coupled plasma at ultra-low pressure was studied. High-aspect-ratio of 28 for 60-nm-wide slots and 17 for air-holes with diameter of 200 nm was achieved, respectively.
Broadband (18 nm) switching functionality is realized by an ultra-compact (8 μm×17 μm) W2 photonic crystal waveguide with integrated microheater on the surface. Extinction ratio larger than 15 dB is obtained over the entire bandwidth.
Thermo-optic switch based on double-slot photonic crystal waveguide is demonstrated, high extinction ratio of 17 dB has been experimentally achieved under a switching power as low as 9.2 mW while the device is only 16-μm-long.
We demonstrated and fabricated a 20µm-long ultra-compact variable optical attenuator based on thermo-optical effect with slow light photonic crystal waveguide (PCWG). In simulation, we optimize the line-defect width and radius/period ratio (r/a) of the PCWG for deep photonic band gap and large slope photonic band edge. An r/a=140nm/410nm W1 PCWG is selected for its −60dB depth and 36dB variable attenuation...
Two dimensional slab photonic crystal waveguides were designed and fabricated. Full photonic band gap, band gap guided mode, and mini-stop-bands were observed. Passive and active performances were investigated theoretically and experimentally.
In this paper, we propose a fluid sensor based on transmission dip caused by mini stop-band in 2D photonic crystal waveguides. Simulation results shows that it has large detective range and relative high sensitivity.
Mode selection mechanism is induced to W3 photonic crystal waveguide by combining a microcavity structure inside the waveguide. Modified mode characteristics are analyzed by photonic energy band and FDTD simulation.
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