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Träfflista för sökning "WFRF:(Parhizkar S.) srt2:(2022)"

Sökning: WFRF:(Parhizkar S.) > (2022)

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1.
  • Negm, N., et al. (författare)
  • Graphene waveguide-integrated thermal infrared emitter
  • 2022
  • Ingår i: Device Research Conference - Conference Digest, DRC. - : Institute of Electrical and Electronics Engineers (IEEE).
  • Konferensbidrag (refereegranskat)abstract
    • Low-cost and easily integrable mid-infrared (MIR) sources are highly desired for photonic integrated circuits. Thermal incandescent MIR sources are widely used. They work by Joule heating, i.e. an electrical current through the emitter causes thermal emission according to Planck's law. Their simple design with only two contact pads makes them integrable with typical optoelectronic components in high-volume production flows. Graphene's emissivity is comparable to common metallic emitters. In contrast to the latter, graphene is transparent at MIR wavelengths, which enables placing large area graphene emitters in the evanescent field of integrated waveguides [1]-[2]. This enhances emission by near-field coupling directly into the waveguide mode, avoiding the mode-mismatch to free space. Here, we present the first experimental demonstration of a graphene emitter placed directly on a photonic waveguide, hence emitting directly into the waveguide mode. 
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2.
  • Lin, Pen-Sheng, et al. (författare)
  • Low-concentration detection of CO2 using suspended silicon waveguides in the mid-IR
  • 2022
  • Ingår i: 2022 Conference on Lasers and Electro-Optics, CLEO 2022. - : Institute of Electrical and Electronics Engineers Inc..
  • Konferensbidrag (refereegranskat)abstract
    • We show detection of CO2 concentrations as low as 500 ppm using a suspended silicon photonic mid-IR waveguide. The performance is enabled by the low propagation loss (2.35 ±0.25) dB/cm permitting sensing with waveguides up to 7 cm in length. 
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4.
  • Parhizkar, Shayan, et al. (författare)
  • Two-Dimensional Platinum Diselenide Waveguide-Integrated Infrared Photodetectors
  • 2022
  • Ingår i: ACS Photonics. - : American Chemical Society (ACS). - 2330-4022. ; 9:3, s. 859-867
  • Tidskriftsartikel (refereegranskat)abstract
    • Low-cost, easily integrable photodetectors (PDs) for silicon (Si) photonics are still a bottleneck for photonic-integrated circuits (PICs), especially for wavelengths above 1.8 mu m. Multilayered platinum diselenide (PtSe2) is a semi-metallic two-dimensional (2D) material that can be synthesized below 450 degrees C. We integrate PtSe2-based PDs directly by conformal growth on Si waveguides. The PDs operate at 1550 nm wavelength with a maximum responsivity of 11 mA/W and response times below 8.4 mu s. Fourier-transform IR spectroscopy in the wavelength range from 1.25 to 28 mu m indicates the suitability of PtSe2 for PDs far into the IR wavelength range. Our PtSe2 PDs integrated by direct growth outperform PtSe2 PDs manufactured by standard 2D layer transfer. The combination of IR responsivity, chemical stability, selective and conformal growth at low temperatures, and the potential for high carrier mobility makes PtSe2 an attractive 2D material for optoelectronics and PICs.
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