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Sökning: WFRF:(Qu Yurui)

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1.
  • Gong, Hanmo, et al. (författare)
  • Photothermal switching based on silicon mach–zehnder interferometer integrated with light absorber
  • 2016
  • Ingår i: IEEE Photonics Journal. - : Institute of Electrical and Electronics Engineers (IEEE). - 1943-0655. ; 8:2
  • Tidskriftsartikel (refereegranskat)abstract
    • We present an all-optical switch based on photothermal effects in a silicon Mach-Zehnder interferometer (MZI) integrated with a light absorber. The metal-insulator-metal light absorber located near the longer arm of the asymmetric MZI efficiently converts infrared light to heat. Pumped by a continuous-wave 1064-nm laser, the spectral transmittance of the fully etched strip waveguide (half-etched rib waveguide) MZI can be tuned with an efficiency of 38 pm/mW (98.5 pm/mW). Dynamic switching experiments show that the rise/fall time constant of the output probe light is 11.45/10.98 μs (8.25/7.13 μs) for the fully etched (half-etched) MZI.
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2.
  • Tian, Jingyi, et al. (författare)
  • Active control of anapole states by structuring the phase-change alloy Ge2Sb2Te5
  • 2019
  • Ingår i: Nature Communications. - : NATURE PUBLISHING GROUP. - 2041-1723. ; 10
  • Tidskriftsartikel (refereegranskat)abstract
    • High-index dielectric nanoparticles supporting a distinct series of Mie resonances have enabled a new class of optical antennas with unprecedented functionalities. The great wealth of multipolar responses has not only brought in new physical insight but also spurred practical applications. However, how to make such a colorful resonance palette actively tunable is still elusive. Here, we demonstrate that the structured phase-change alloy Ge2Sb2Te5 (GST) can support a diverse set of multipolar Mie resonances with active tunability. By harnessing the dramatic optical contrast of GST, we realize broadband (del lambda/lambda similar to 15%) mode shifting between an electric dipole resonance and an anapole state. Active control of higher-order anapoles and multimodal tuning are also investigated, which make the structured GST serve as a multispectral optical switch with high extinction contrasts (>6 dB). With all these findings, our study provides a new direction for realizing active nanophotonic devices.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Qiu, Min (2)
Qu, Yurui (2)
Yan, Min (1)
Chen, Xi (1)
Li, Qiang (1)
Gong, Hanmo (1)
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Yang, Yuanqing (1)
Zhao, Ding (1)
Luo, Hao (1)
Bozhevolnyi, Sergey ... (1)
Ding, Fei (1)
Tian, Jingyi (1)
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Umeå universitet (1)
Kungliga Tekniska Högskolan (1)
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Naturvetenskap (2)

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