- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Counterpropagating continuous-variable entangled states in lossy coupled-cavity optical waveguides
摘要： We present an integrated source of counterpropagating entangled states based on a coupled resonator optical waveguide that is pumped by a classical pulsed source incident from above the waveguide. We investigate theoretically the generation and propagation of continuous-variable entangled states in this coupled-cavity system in the presence of intrinsic loss. Using a tight-binding approximation, we derive analytic time-dependent expressions for the number of photons in each cavity, as well as for the correlation variance between the photons in different pairs of cavities, to evaluate the degree of quantum entanglement. We also derive simple approximate expressions for these quantities that can be used to guide the design of such systems, and discuss how pumping configurations and physical properties of the system affect the photon statistics and the degree of quantum correlation.
关键词： quantum entanglement,lossy coupled-cavity optical waveguides,continuous-variable entangled states,counterpropagating,tight-binding approximation
更新于2025-09-11 14:15:04
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Shape-optimized multi-mode interference for a wideband visible light coupler
摘要： We developed a wideband visible light coupler based on multi-mode interference (MMI) using silica planar lightwave circuit (PLC) technology. The MMI shape was designed by using analytical and numerical optimization techniques to expand the transmission range around the target wavelength. We used this method for green (G) and blue (B) coupler to expand G and B transmission range. The transmittances of the fabricated coupler designed by the hybrid design method were ?1.5 to ?1.0 dB at wavelengths of 430 to 465 nm and ?0.5 to ?0.1 dB at wavelengths of 508 to 625 nm, respectively. The coupler length is about 1 mm without an input/output circuit. The coupler can be used for the whole wavelength range of G and B as a GB coupler.
关键词： Displays,Multimode interference,Wavelength division multiplexing,RGB coupler,Optical waveguides
更新于2025-09-10 09:29:36
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Guiding light
摘要： Light trapped in hair-thin optical “wires” made of transparent materials such as glass can be piped around tight corners in computer chips, across oceans in telecommunications and back and forth inside a cavity in lasers. By eliminating beam diffraction, and allowing precise control over the beam shape and the chromatic dispersion, optical waveguides make many astonishing things possible.
关键词： dispersion,photonic crystal fibres,optical waveguides,diffraction,telecommunications,lasers
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Cavity Optomechanical Photothermal Sensors
摘要： We experimentally demonstrate a cavity optomechanical sensor that is actuated with gradient optical forces. The sensor can detect incident radiation via absorption and resulting photothermally-induced frequency shifts of the nanomechanical oscillator. Analysis suggests that nanostrain sensitivity and fJ-level energy detection are possible.
关键词： Photothermal effects,Strain measurement,Nanoelectromechanical systems,Nanosensors,Optical waveguides,Nanophotonics
更新于2025-09-09 09:28:46
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Engineering Modes of PT Symmetric Photonic Crystals
摘要： This work explores the effects of parity-time (PT) symmetry on the modes of photonic crystal defect waveguides. Two designs are considered. In the ?rst, the defect modes are protected from PT transitions, but edge modes in the complex conjugate frequency regime appear. In the second design, the defect modes exhibit thresholdless PT transitions.
关键词： photonic crystals,optical waveguides,parity-time symmetry,photonic integrated circuits,semiconductor waveguides
更新于2025-09-04 15:30:14
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[IEEE 2018 Iranian Conference on Electrical Engineering (ICEE) - Mashhad (2018.5.8-2018.5.10)] Electrical Engineering (ICEE), Iranian Conference on - Tunable Filter by Using Parity Time (PT) Symmetric Periodic Array Electronic
摘要： A circuit model of a periodic array of PT-symmetric (gain/loss coupled) waveguides is reported for the design of a novel tunable filter. This model consists of a pair of coupled circuits, one with amplification resistance and the other with an equivalent attenuation. By varying the value of the gain/loss, one can control the size of bandgap and hence the allowed frequencies propagating within the structure. For a critical value of gain/loss, the eigenvalues merge and the gap disappears. As a result, all frequencies can pass the structure i.e, an all pass filter. The Q-factor of reflected frequency can be varied such that, tunable Q from 20 to greatest has been successfully realized in the central frequency of 0.283 MHz. The remarkable feature of this design lies with its tunability, high speed, and relative simplicity.
关键词： RLC Circuit Model,Parity-Time (PT) Symmetry,Grating Waveguides,Optical Waveguides,Band Stop Filter (BSF)
更新于2025-09-04 15:30:14