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We present a 20 Gb/s monolithically integrated transmitter with stacked CMOS driver and periodic-loaded PN-junction Mach-Zehnder modulator fabricated in IBM's sub-100nm technology node. Transmitter extinction ratios of 10 dB at 20 Gb/s are demonstrated.
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 propose a reflective phase-only modulator formed by two layers of high-contrast grating reflectors. By arranging such optical phase modulators in a 2D array, ultra-fast Si-based phase-only spatial light modulators can be realized.
A dual-mode, graphene optical modulator and detector for the near-IR is demonstrated in a single device. Gate dependent photocurrent and optical transmission allow the device to operate in a highly novel mode of simultaneous optical modulation and detection.
Microring based silicon depletion modulators with high extinction ratios (>25dB) are used for high frequency modulation and as resonant photodetectors at 1340nm (O-band). Photocurrent and power enhancement are investigated for mircorings with different Q-factors.
We demonstrate metamaterial with a cubic optical nonlinearity that is ten orders of magnitude greater than the reference nonlinearity of CS2. The nonlinearity has optomechanical nature and is underpinned by light-induced electromagnetic near-field interactions.
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