Hybrid integration of van der Waals materials on a photonic platform enables diverse exploration of novel active functions and significant improvement in device performance for next-generation integrated photonic circuits, but developing waveguide-integrated photodetectors based on conventionally investigated transition metal dichalcogenide materials at the full optical telecommunication bands and mid-infrared range is still a challenge. Here, we integrate PdSe 2 with silicon waveguide for onchip photodetection with a high responsivity from 1260 to 1565 nm, a low noise-equivalent power of 4.0 pW•Hz −0.5 , a 3-dB bandwidth of 1.5 GHz, and a measured data rate of 2.5 Gbit•s −1 . The achieved PdSe 2 photodetectors provide new insights to explore the integration of novel van der Waals materials with integrated photonic platforms and exhibit great potential for diverse applications over a broad infrared range of wavelengths, such as on-chip sensing and spectroscopy.
With a fixed geometric design, homogeneous change of Indium Selenide (
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) switches the focusing length of a silicon photonic metalens between positive and negative values. This unique functionality of the hybrid metasurface is attributed to the fact that the silicon’s refractive index is in the middle of the two convertible states in the optical phase change material. The infrared transparency of
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in both states enables near phase-only metasurface structures. The design is foundry compatible and feasible for implementing nonvolatile adaptive transformation optic systems on-chip.
Intensity-modulated surface plasmon resonance (SPR) array sensor based on polarization control was introduced and the impacts of incident angle, gold firm thickness, polarizer angle, wavelength and data processing on its sensitivity and measuring range were analyzed. It was concluded that in an easily controllable measurement range, an appropriate parameter selection can be set and produce high sensitivity with a simple optical and mechanical structure and lower production costs. This scheme can be widely applied to the high-throughput detection of bimolecular interaction analysis, environment monitoring, food safety, pharmaceutical analysis, biomedical engineering and other fields.
Two‐dimensional (2D) materials with unique physicochemical properties promote photocatalytic activities. As the 2D material composites research studies the statistical average of complex catalytic behaviors, an integrated photonic platform allows for clean and single flake level photo‐catalytic investigations with precisely quantified photocatalytic activities. In this paper, fluence‐dependent photo‐oxidation in two‐dimensional Tellurene (2D Te) is tracked by the evanescently coupled micro‐resonator. Nearly 32% of oxidation is achieved in ≈10 nm 2D Te flake, compared to only 4.5% oxidation in a 30 nm sample, probed by the resonance shift in silicon micro‐ring resonators substrate. The wider bandgap in the few layers of 2D Te allows faster charge transfer to adsorbed oxygen for a more efficient photocatalytic redox reaction. The photo‐oxidation in hybrid 2D Te results in invariant lineshapes of optical transmission resonance for wavelength trimming (more than 3× resonance bandwidth). The low threshold power, near‐infrared, and in‐waveguide resonance trimming scheme is compatible with most integrated photonic setups for easy fixing of the nanofabrication‐induced random resonance deviation for integrated photonic circuit applications in wavelength‐division‐multiplexing systems and spin qubits quantum computing.
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