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Photonic integration with 2-D materials conventionally relied on transfer processes. We developed an approach to monolithically fabricate photonic devices on 2-D materials including graphene and demonstrated its significant potential for high-performance photonic integration.
We report a new group of optical phase change materials Ge-Sb-Se-Te (GSST) with low loss from telecom bands to LWIR. We further demonstrated GSST-integratedSiN photonics with significantly improved switching performance over conventional GST alloys.
We demonstrated a flexible waveguide-integrated metal-semiconductor-metal photodetector with 0.5 A/W responsivity near 1550 nm wavelength. The device can withstand a small bending radius of 0.7 mm without optical performance degradation.
Here we report on the fabrication and characterization of air-clad on-chip chalcogenide microdisk cavities (Q=32,000) at wavelengths of 2.0–2.5 microns for infrared spectroscopy. In addition, we analyze a method of photothermal sensing that leverages high-thermal confinement in optical microcavities that is theoretically capable of achieving part-perbillion (ppb) level detection of trace gas molecules.
Infrared (IR) spectroscopy is widely recognized as a gold standard technique for chemical analysis. Traditional IR spectroscopy relies on fragile bench-top instruments located in dedicated laboratory settings, and is thus not suitable for emerging field-deployed applications such as in-line industrial process control, environmental monitoring, and point-of-care diagnosis. Recent strides in photonic...
A 340GHz modulator based on double-layer metal hole arrays was presented in this paper. The controllable permittivity of nematic liquid crystals is utilized to realize a tunable THz transmittance. The transmission characteristics of the terahertz electromagnetic waves and following LC parameters have been calculated and analyzed. At 340GHz, modulator achieves an intensity modulation depth of 91.3%...
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