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We have investigated the Bragg gratings for surface plasmonic polaritons modes in the metal-dielectric-air waveguide and proposed a bidirectional coupler which is capable to guide the incident light at different wavelengths along two predetermined directions.
We demonstrate that since the group velocity of spoof surface plasmon polariton modes at the cutoff frequency is extremely low, electromagnetic waves with different frequencies can be slowed down or even stopped at different positions.
We demonstrate ultrafast self- and cross-absorption saturation and self-phase modulation based on near-infrared intersubband transitions in GaN/AlN quantum-well waveguides designed to minimize the nonlinear switching energy.
We investigate characteristics of waveguide using highly-reflective semiconductor in the Restrahlen band. We identify spectral operating regions within the Restrahlen band of a cladding layer that offers advantages over both traditional dielectric waveguide and metal clad waveguides using surface plasmon polaritons.
GaAs nano-wire waveguides were successfully fabricated on a SiO2/Si substrate for the first time. 15 dB cross loss modulation was achieved by a few mW continuous-wave pump power within a 1.5 mm-long waveguide.
THz absorption spectra of planar ordered polycrystalline films of melamine were measured at 295 K and 77 K with linewidths considerably narrower than for conventional THz (far-infrared) spectroscopy.
We demonstrate strongly enhanced optical trapping forces on sub-micron-diameter dielectric spheres within a pressure-driven microfluidic flow of several hundred mum/s using the evanescent field of the light in silicon waveguides.
We demonstrate the first photonic chip designed in a commercial bulk CMOS process (65 nm node) using standard process layers combined with scalable post-processing, enabling dense photonic integration with high-performance microprocessor electronics.
A numerical investigation on noise figure (NF) inside the silicon waveguides pumped with high-repetition-rate pulses is carried out. The parameters of pump pulses are important to generate net gain and <7dB NF in silicon waveguides.
We present a novel subwavelength microstrip architecture for efficient broadband THz waveguiding that utilizes dipole antennas at the input-face for enhanced THz coupling. Experiments as well as simulation results demonstrate efficient broadband waveguiding capability.
A dual purpose femtosecond laser processing and 5D spectroscopic (xyz, time, wavelength) microscopy system provides intelligent in-situ analysis and on-the-fly control of optical waveguides during laser writing. Definitive evidence of heat accumulation effects is reported.
Numerical simulations are used to design integrated metallic photonic crystal waveguide coupled cavities with sharp resonances. THz time-domain spectroscopy (THz-TDS) is used to characterize these waveguides. A good match between theory and experiment is shown.
Highly asymmetrical plasmonic waveguides exhibit guiding in dimensions below the expected cutoff. A new family of discrete guided modes of asymmetrical waveguides with losses is found, which assists in nano plasmonic guiding.
We report the first high-current photodiode based on the slab-coupled optical waveguide concept. The device has a large mode (5.8 times 7.6 mum) and ultra-low optical confinement (Gamma ~ 0.05%), allowing a 2-mm absorption length. The maximum photocurrent obtained was 250 mA (R = 0.8-A/W) at 1.55 mum.
Asymmetric directional couplers were written inside bulk borosilicate glass by a high repetition rate femtosecond laser. Wavelength-dependent coupling ratios were tuned by laser exposure and coupler geometry, yielding flattened spectral response (plusmn5%) over >400-nm bandwidth.
We fabricated lattice-shifted photonic crystal waveguides stably showing low dispersion slow light in a wide wavelength bandwidth. The two photon absorption and self-phase modulation were clearly enhanced for sub-ps optical pulses.
We investigate for the first time optical beam dynamics in parity-time (PT) synthetic structures. We show that PT symmetric systems can exhibit a host of intriguing characteristics such as non-reciprocal Bloch modes and power oscillations.
We fabricated planar and cylindrical waveguides in transparent dielectrics by using ultrafast Bessel beams instead of commonly used Gaussian beams. Excellent quality waveguides with low losses were produced by focusing millijoule femtosecond pulses with axicons.
We present the first experimental demonstration of recently proposed loop-coupled resonator device concepts, with characteristic transmission zeros, enabling optimally sharp passbands for channel add-drop filter applications. Fourth-order SiN-core and Si-core strong-confinement microring-resonator designs are described.
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