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A drastic Q factor variation from 7900 to 1200 is observed in a silicon ring resonator loaded by micrometer-scale graphene with various lengths. The significant decay of the Q factor agrees with a numerical analysis.
Using a tape-assist-transfer method and micromanipulation, we have fabricated graphene coated ZnO nanowire (GZN) optical waveguides. The GZNs exhibit significant saturable absorption (differential transmission of 15% at 1064nm), which can be employed for optical modulation.
We present graphene-based optical modulators integrated with Si3N4 waveguides which provide broadband flat absorption from visible to infrared wavelengths. Tunable attenuation of 0.067 dB/µm is measured in Mach-Zehnder interferometers and microring resonators.
We demonstrate the enhanced four-wave mixing generated in silicon photonic crystal waveguides with monolayer graphene. An enhanced high conversion efficiency and wide detuning bandwidth is observed.
Based on graphene plasmonic waveguides, we developed a graphene plasmonic photodetector to detect horizontally incident light signal. The photocurrent is the maximum at the graphene-metal interface and the time constant is less than 39.7 ms.
We present a graphene based absorption modulator on SOI waveguide with very low insertion loss. The device showed a modulation of 16 dB and an insertion loss of only 3.3dB, surpassing GeSi based absorption modulators.
We report a passively Q-switched 1.9 µm thulium ZBLAN waveguide laser based on an extended cavity containing a flake-graphene saturable absorber film. The 790nm diode-laser-pumped laser produces up to 6 mW with ∼1.4 µs pulses at ∼25 kHz.
We show theoretically that Bragg stopband and defect resonance mode can be achieved and dynamically tuned over a wide wavelength range by a small change in Fermi energy level of graphene, in graphene plasmonic waveguide structures.
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