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The transmission amplitudes of SNAP (Surface Nanoscale Axial Photonics) devices are determined and applied to investigation of basic SNAP structures The developed theory and, in particular, the transmission amplitudes determined in this paper are critical for the design of new SNAP devices and can be directly used in the analysis of the performance of fabricated devices.
We demonstrate a Si3N4 waveguide optical resonator with a record high quality factor of 55 million using planar waveguide couplers. Investigations into coupler losses are studied to further increase performance.
Fiber to silicon nitride waveguides coupling is achieved using silicon grating coupler with a transition. Two optimized couplers are designed for TE and TM mode excitation, achieving over 55% efficiency. Fabrication issues are also discussed.
We demonstrate a through etched subwavelength grating coupler, which can be patterned together with other photonic components. It achieves a very high coupling efficiency of 59% with a 3dB bandwidth of 60 nm.
We experimentally and theoretically study coupled semiconductor ring lasers. We report on the destabilization of unidirectional operation for large coupling strengths and the appearance of a coupling-induced bidirectional state, both undesirable for optical memory operation.
Pulses emitted by an excitable (asymmetric) semiconductor ring laser are experimentally and theoretically characterized. We numerically show that it is possible to mimic neural functionality by considering them in a coupled configuration.
The quantum Langevin analysis for QCLs show that coupling strength and dephasing rate strongly affect the linewidth of THz QCLs in incoherent resonant-tunneling transport regime, but induce insignificant influence for mid-infrared QCLs due to strong coupling.
Spatial multiplexing has the potential to overcome the capacity-bottleneck of single-fiber long-haul links. We review recent experimental progress and discuss relevant performance vs. complexity trade-offs from a systems perspective.
The required equalizer complexity for GI-MMF (graded index multi-mode fiber) transmitting 15 spatial modes is numerically calculated with different bend radius in 112 Gb/s DP-QPSK transmission.
We demonstrate that a whispering gallery mode (WGM) microtoroidal optical resonator retains its high quality factor Q > 107 when encapsulated into a low index polymer matrix. We tested the packaged system in water with various salt concentrations and temperatures, and in air under various room conditions, showing that the polymer package keeps the resonator intact from degrading effects of environment,...
A novel design of THz-bandwidth all-optical arbitrary-order differentiators based on phase-shifted long period fiber/waveguide gratings is proposed and numerically demonstrated. This solution offers a dramatically increased tolerance against practical variations in the grating parameters (e.g. coupling strength).
The experimental realization of a nanoscale, high efficiency, and non-resonant broadband orthogonal junction as a coupling scheme between plasmonic slot and silicon waveguide is presented. This serves as an enabling platform for hybrid plasmonic interconnects.
A novel polarization splitting is proposed through plasmonic-dielectric coupling with ultrashort coupling length. Extinction ratios of 20.8 dB and 17.0 dB for TE and TM polarizations are achieved at a coupling length of 4.13 µm.
We demonstrate an integrated silicon and ultra-low-loss silica waveguide platform. Coupling between layers is achieved with (0.4±0.2) dB of loss per transition and a 20 nm 3-dB bandwidth.
III–V semiconductor photonic crystal nanolasers are heterogeneously integrated on a SOI waveguides circuitry. We demonstrate this approach constitutes an efficient way to interface these ultimate lasers. Coupling efficiency and optical bistability will be discussed.
We proposed a novel method to fabricate liquid-core photonic crystal fibers by utilizing a ring-core hollow optical fiber, which could overcome the previous structural limitation, enhance the light coupling efficiency, and prevent the liquid evaporation.
We demonstrate a single silicon microring resonator Mach-Zehnder modulator driven by thermo-optic effect. The proposed modulator was fabricated using CMOS process. The modulation characteristics show that the power consumption can be reduced to one fifteenth.
Optical dipole nano-antennas are passive devices needing light from external sources. In this work, highly efficient coupling of light from microdisk lasers into plasmonic nano-antennas by using nano-tapers is proposed.
We demonstrate near field enhancement generation in a silver nanoantenna-superlens system. Using near-field coupling effect and genetic algorithm for optimization we can design a nanoantenna-superlens system with mismatched permittivities for sensing applications.
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