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Sökning: L773:1094 4087 > Qiu Min

  • Resultat 1-10 av 52
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1.
  • Ako, Thomas, et al. (författare)
  • Design of invisibility cloaks with an open tunnel
  • 2010
  • Ingår i: Optics Express. - 1094-4087. ; 18:26, s. 27060-27066
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we apply the methodology of transformation optics for design of a novel invisibility cloak which can possess an open tunnel. Such a cloak facilitates the insertion (retrieval) of matter into (from) the cloak's interior without significantly affecting the cloak's performance, overcoming the matter exchange bottleneck inherent to most previously proposed cloak designs. We achieve this by applying a transformation which expands a point at the origin in electromagnetic space to a finite area in physical space in a highly anisotropic manner. The invisibility performance of the proposed cloak is verified by using full-wave finite-element simulations. (C) 2010 Optical Society of America
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2.
  • Ako, Thomas, et al. (författare)
  • Design of invisibility cloaks with an open tunnel
  • 2010
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 18:26, s. 27060-27066
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we apply the methodology of transformation optics for design of a novel invisibility cloak which can possess an open tunnel. Such a cloak facilitates the insertion (retrieval) of matter into (from) the cloak’s interior without significantly affecting the cloak’s performance, overcoming the matter exchange bottleneck inherent to most previously proposed cloak designs. We achieve this by applying a transformation which expands a point at the origin in electromagnetic space to a finite area in physical space in a highly anisotropic manner. The invisibility performance of the proposed cloak is verified by using full-wave finite-element simulations.
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3.
  • Chen, Xi, et al. (författare)
  • Photothermally tunable silicon-microring-based optical add-drop filter through integrated light absorber
  • 2014
  • Ingår i: Optics Express. - 1094-4087. ; 22:21, s. 25233-25241
  • Tidskriftsartikel (refereegranskat)abstract
    • An optically pumped thermo-optic (TO) silicon ring add-drop filter with fast thermal response is experimentally demonstrated. We propose that metal-insulator-metal (MIM) light absorber can be integrated into silicon TO devices, acting as a localized heat source which can be activated remotely by a pump beam. The MIM absorber design introduces less thermal capacity to the device, compared to conventional electrically-driven approaches. Experimentally, the absorber-integrated add-drop filter shows an optical response time of 13.7 mu s following the 10%-90% rule (equivalent to a exponential time constant of 5 mu s) and a wavelength shift over pump power of 60 pm/mW. The photothermally tunable add-drop filter may provide new perspectives for all-optical routing and switching in integrated Si photonic circuits.
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4.
  • Chen, Xi, et al. (författare)
  • Photothermally tunable silicon-microring-based optical add-drop filter through integrated light absorber
  • 2014
  • Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 22:21, s. 25233-25241
  • Tidskriftsartikel (refereegranskat)abstract
    • An optically pumped thermo-optic (TO) silicon ring add-drop filter with fast thermal response is experimentally demonstrated. We propose that metal-insulator-metal (MIM) light absorber can be integrated into silicon TO devices, acting as a localized heat source which can be activated remotely by a pump beam. The MIM absorber design introduces less thermal capacity to the device, compared to conventional electrically-driven approaches. Experimentally, the absorber-integrated add-drop filter shows an optical response time of 13.7 μs following the 10%–90% rule (equivalent to a exponential time constant of 5 μs) and a wavelength shift over pump power of 60 pm/mW. The photothermally tunable add-drop filter may provide new perspectives for all-optical routing and switching in integrated Si photonic circuits.
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5.
  • Chen, Yiting, et al. (författare)
  • Honeycomb-lattice plasmonic absorbers at NIR : anomalous high-order resonance
  • 2013
  • Ingår i: Optics Express. - 1094-4087. ; 21:18, s. 20873-20879
  • Tidskriftsartikel (refereegranskat)abstract
    • We design, fabricate and characterize a plasmonic honeycomb lattice absorber with almost perfect absorption at 1140 nm over a wide incident angle range. This absorber also possesses a narrow-band, angle-and polarization-dependent high-order resonance in the short-wavelength range, with a bandwidth of 19 nm and angle sensitivity of 3 nm per degree. The nature of this high-order absorption band is analyzed through finite-element simulations. We believe it is due to Bragg coupling of the incident light to the backward-propagating surface plasmon polariton through the periodic modulation of the structure. Such fine absorption bands can find applications in plasmonic sensors and spectrally selective thermal emitters.
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6.
  • Chen, Yiting, et al. (författare)
  • Honeycomb-lattice plasmonic absorbers at NIR : anomalous high-order resonance
  • 2013
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 21:18, s. 20873-20879
  • Tidskriftsartikel (refereegranskat)abstract
    • We design, fabricate and characterize a plasmonic honeycomb lattice absorber with almost perfect absorption at 1140 nm over a wide incident angle range. This absorber also possesses a narrow-band, angle- and polarization-dependent high-order resonance in the short-wavelength range, with a bandwidth of 19 nm and angle sensitivity of 3 nm per degree. The nature of this high-order absorption band is analyzed through finite-element simulations. We believe it is due to Bragg coupling of the incident light to the backward-propagating surface plasmon polariton through the periodic modulation of the structure.Such fine absorption bands can find applications in plasmonic sensors and spectrally selective thermal emitters.
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7.
  • Chen, Yiting, et al. (författare)
  • Metal-insulator-metal plasmonic absorbers : influence of lattice
  • 2014
  • Ingår i: Optics Express. - 1094-4087. ; 22:25, s. 30807-30814
  • Tidskriftsartikel (refereegranskat)abstract
    • We experimentally demonstrate three kinds of metal-insulator-metal based plasmonic absorbers consisting of arrays of gold nanodisks distributed in different lattices, including square, triangular and honeycomb lattices. It's found that resonances originated from localized surface plasmon undergo little changes with respect to different lattice distributions of the nanodisks. The interparticle coupling results in a minor bandwidth broadening of the fundamental mode. Different from square-and triangular-lattice absorbers, honeycomb-lattice absorber possesses a unique red-shifting (with respect to incident angles) narrow-band high-order mode, which originates from coupling of incident light to propagating surface plasmon polariton (SPP) waves. Similar high-order mode can also be generated in square-lattice absorber by increasing the period so that a smaller reciprocal lattice vector can be introduced to excite the SPP mode. Furthermore, we show that two types of resonances can interact and create Fano-type resonances. The simulation results agree well with the experimental results. (C) 2014 Optical Society of America
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8.
  • Chen, Yiting, et al. (författare)
  • Metal-insulator-metal plasmonic absorbers : influence of lattice
  • 2014
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 22:25, s. 30807-30814
  • Tidskriftsartikel (refereegranskat)abstract
    • We experimentally demonstrate three kinds of metal-insulator-metal based plasmonic absorbers consisting of arrays of gold nanodisks distributed in different lattices, including square, triangular and honeycomb lattices. It’s found that resonances originated from localized surface plasmon undergo little changes with respect to different lattice distributions of the nanodisks. The interparticle coupling results in a minor bandwidth broadening of the fundamental mode. Different from square- and triangular-lattice absorbers, honeycomb-lattice absorber possesses a unique red-shifting (with respect to incident angles) narrow-band high-order mode, which originates from coupling of incident light to propagating surface plasmon polariton (SPP) waves. Similar high-order mode can also be generated in square-lattice absorber by increasing the period so that a smaller reciprocal lattice vector can be introduced to excite the SPP mode. Furthermore, we show that two types of resonances can interact and create Fano-type resonances. The simulation results agree well with the experimental results.
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9.
  • Chen, Yiting, et al. (författare)
  • Plasmonic analog of microstrip transmission line and effect of thermal annealing on its propagation loss
  • 2013
  • Ingår i: Optics Express. - 1094-4087. ; 21:2, s. 1639-1644
  • Tidskriftsartikel (refereegranskat)abstract
    • We fabricated a plasmonic analog of the microwave microstrip transmission line and measured its propagation loss before and after thermal annealing. It is found that its propagation loss at 980 nm wavelength can be reduced by more than 50%, from 0.45 to 0.20 dB/μm, after thermal annealing at 300 °C. The reduction in loss can be attributed to the improved gold surface condition and probably also to the change in the metal's inner structure. Less evident loss reduction is noticed at 1550 nm, which is owing to extremely small portion of the modal electric field located in the metal regions at this wavelength.
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10.
  • Chen, Yiting, et al. (författare)
  • Plasmonic analog of microstrip transmission line and effect of thermal annealing on its propagation loss
  • 2013
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 21:2, s. 1639-1644
  • Tidskriftsartikel (refereegranskat)abstract
    • We fabricated a plasmonic analog of the microwave microstrip transmission line and measured its propagation loss before and after thermal annealing. It is found that its propagation loss at 980 nm wavelength can be reduced by more than 50%, from 0.45 to 0.20 dB/μm, after thermal annealing at 300 °C. The reduction in loss can be attributed to the improved gold surface condition and probably also to the change in the metal’s inner structure. Less evident loss reduction is noticed at 1550 nm, which is owing to extremely small portion of the modal electric field located in the metal regions at this wavelength.
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  • Resultat 1-10 av 52

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