Ehsan Shah Hosseini

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High quality (Q approximately 6 x 10(5)) microdisk resonators are demonstrated in a Si(3)N(4) on SiO(2) platform at 652-660 nm with integrated in-plane wrap-around coupling waveguides to enable critical coupling to specific microdisk radial modes. Selective coupling to the first three radial modes with >20dB suppression of the other radial modes is achieved(More)
Silicon photonics has emerged as the leading candidate for implementing ultralow power wavelength-division-multiplexed communication networks in high-performance computers, yet current components (lasers, modulators, filters and detectors) consume too much power for the high-speed femtojoule-class links that ultimately will be required. Here we demonstrate(More)
The strong thermooptic effect in silicon enables low-power and low-loss reconfiguration of large-scale silicon photonics. Thermal reconfiguration through the integration of metallic microheaters has been one of the more widely used reconfiguration techniques in silicon photonics. In this paper, structural and material optimizations are carried out through(More)
We report on integrated erbium-doped waveguide lasers designed for silicon photonic systems. The distributed Bragg reflector laser cavities consist of silicon nitride waveguide and grating features defined by wafer-scale immersion lithography and a top erbium-doped aluminum oxide layer deposited as the final step in the fabrication process. The resulting(More)
We present our recent progress in designing nanophotonic devices for integrated sensing applications. We focus on Si-based microresonators and on-chip spectrometers as the main building blocks to implement compact sensing platforms with strong light-matter interaction. The performance of these devices is discussed, and their future prospects in realizing(More)
We present experimental evidence for strong angular dispersion in a planar photonic crystal (PC) structure by properly engineering the modes in the second PC band. We show that by using the second photonic band of a square lattice PC, angular dispersion of 4 degrees /nm can be achieved. We also show that major challenges in designing practical PC devices(More)
We demonstrate almost synchronized temperature dependent wavelength shift of Al<inf>2</inf>O<inf>3</inf>:Er<sup>3+</sup> DFB laser (2.57 GHz/&#x00B0;C) and Si<inf>3</inf>N<inf>4</inf> ring filter (2.47 GHz/&#x00B0;C), which makes it possible for on-chip transceiver operation without temperature control.
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