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Träfflista för sökning "WFRF:(Zhu Ning) ;pers:(Xu Tao)"

Sökning: WFRF:(Zhu Ning) > Xu Tao

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1.
  • Xu, Tao, et al. (författare)
  • A pillar-array based 2-dimensional photonic crystal microcavity
  • 2009
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 94, s. 241110-
  • Tidskriftsartikel (refereegranskat)abstract
    • Experimental results are presented for a high quality factor cavity based on pillar arrays. The cavityis formed from a square lattice of silicon pillars of finite height. The quality factor of the fundamental mode is about 7300 when the cavity is in air and 7800 when it is immersed in water.Since a pillar array has a large percent of connected void space and confines TM modes effectively,it has great promise for use in numerous areas including biochemical sensing and quantum cascade lasers.
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2.
  • Xu, Tao, et al. (författare)
  • Pillar-array based optical sensor
  • 2010
  • Ingår i: Optics Express. - 1094-4087. ; 18:6, s. 5420-5425
  • Tidskriftsartikel (refereegranskat)abstract
    • An optical microcavity based on pillar arrays has been fabricated in Si/SiO2 material system. Transmission measurement was taken and a quality factor as high as 27,600 was observed. This cavity was tested for sensing applications by immersing into optical fluids with accurate refractive indices. For refractive index change of 0.01, a resonance peak wavelength shift of 3.5 nm was measured. We also compare cavities consisting of pillars with different aspect ratios.
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3.
  • Xu, Tao, et al. (författare)
  • Silicon-on-insulator nanopillar-array optical sensor
  • 2011
  • Ingår i: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. - : SPIE - International Society for Optical Engineering. - 9780819484451
  • Konferensbidrag (refereegranskat)abstract
    • Pillar-array based optical cavities have unique properties, e.g., having a large and connected low dielectric index space (normally air space), having a large percent of electric field energy in air and standing on a substrate. These properties make them well suitable to make ultra compact and highly sensitive label-free optical sensors to detect bio-/chemical reactions. We designed, fabricated, and measured a silicon-on-insulator pillar array microcavity that possesses a quality factor as high as 27,600. We studied its sensitivity for both bulk index change and surface index modification. As a bulk index sensor, for environmental refractive index change of 0.01, a resonance peak wavelength shift of 3.5 nm was measured. As a surface index sensor, the simulations show, for a coating with thickness of 1 nm, the resonance wavelength shifts as large as 2.86 nm. Combining with a sharp 0.06 nm wide resonance peak, our pillar-array sensor is able to resolve ultra small bulk and surface refractive index changes caused by target molecules.
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  • Resultat 1-3 av 3

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