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1.
  • Li, Qiang, et al. (creator_code:aut_t)
  • Coupled mode theory analysis of mode-splitting in coupled cavity system
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:8, s. 8367-8382
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We analyze transmission characteristics of two coupled identical cavities, of either standing-wave (SW) or traveling-wave (TW) type, based on temporal coupled mode theory. Mode splitting is observed for both directly (cavity-cavity) and indirectly (cavity-waveguide-cavity) coupled cavity systems. The effects of direct and indirect couplings, if coexisting in one system, can offset each other such that no mode splitting occurs and the original single-cavity resonant frequency is retained. By tuning the configuration of the coupled cavity system, one can obtain different characteristics in transmission spectra, including splitting in transmission, zero transmission, Fano-type transmission, electromagnetically-induced-transparency (EIT)-like transmission, and electromagnetically-induced-absorption (EIA)-like transmission. It is also interesting to notice that a side-coupled SW cavity system performs similarly to an under-coupled TW cavity. The results are useful for the design of cavity-based devices for integration in nanophotonics.
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2.
  • Li, Qiang, et al. (creator_code:aut_t)
  • Coupled mode theory analysis of mode-splitting in coupled cavity system
  • 2010
  • record:In_t: Optics Express. - : The Optical Society. - 1094-4087. ; 18:8, s. 8367-8367
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We analyze transmission characteristics of two coupled identical cavities, of either standing-wave (SW) or traveling-wave (TW) type, based on temporal coupled mode theory. Mode splitting is observed for both directly (cavity-cavity) and indirectly (cavity-waveguide-cavity) coupled cavity systems. The effects of direct and indirect couplings, if coexisting in one system, can offset each other such that no mode splitting occurs and the original single-cavity resonant frequency is retained. By tuning the configuration of the coupled cavity system, one can obtain different characteristics in transmission spectra, including splitting in transmission, zero transmission, Fano-type transmission, electromagnetically-induced-transparency (EIT)-like transmission, and electromagnetically-induced-absorption (EIA)-like transmission. It is also interesting to notice that a side-coupled SW cavity system performs similarly to an under-coupled TW cavity. The results are useful for the design of cavity-based devices for integration in nanophotonics.
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3.
  • Li, Qiang, et al. (creator_code:aut_t)
  • Fast light in silicon ring resonator with resonance-splitting
  • 2009
  • record:In_t: Optics Express. - 1094-4087. ; 17:2, s. 933-940
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We report experimental demonstration of fast light in an over-coupled ultra-compact silicon ring resonator with resonance-splitting. Strong mutual-coupling induced by the grating inside the ring leads to split resonances and accompanying large anomalous dispersion, thus providing a new approach to realizing fast light in the over-coupled region of the ring resonator. In the experiment, a maximum pulse advancement of 130 ps with low distortion is achieved for a 1-ns signal pulse in a 10-mu m-radius silicon ring resonator. The observed pulse advancement agrees well with the theoretical calculation based on coupled mode theory.
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4.
  • Li, Qiang, et al. (creator_code:aut_t)
  • Plasmonic wave propagation in silver nanowires : guiding modes or not?
  • 2013
  • record:In_t: Optics Express. - 1094-4087. ; 21:7, s. 8587-8595
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Propagation modes and single-guiding-mode conditions of one-dimensional silver nanowires based surface plasmon polariton (SPP) waveguides versus the operating wavelength (500-2000 nm) are investigated. For silver nanowires immersed in a SiO2 matrix, both short-range SPP (SRSPP)-like modes and long-range SPP (LRSPP)-like modes can be guided. However, only the LRSPP-like modes have cutoff radii. For silver nanowires on a SiO2 substrate, the LRSPP-like modes cannot be supported due to asymmetry. While for the SRSPP-like guiding mode, it has a cutoff radius for wavelength longer than 615 nm. For wavelength shorter than 615 nm, there is no cutoff radius for the guiding modes due to the appearance of the interface modes and thus the single-guiding-mode operation is always satisfied.
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5.
  • Li, Qiang, et al. (creator_code:aut_t)
  • Structurally-tolerant vertical directional coupling between metal-insulator-metal plasmonic waveguide and silicon dielectric waveguide
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:15, s. 15531-15543
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Vertical directional coupling between a metal-insulator-metal (MIM) plasmonic waveguide and a conventional dielectric waveguide is investigated. The coupling length, extinction ratio, insertion loss and coupling efficiency of the hybrid coupler are analyzed. As an example, when the separation between the two waveguides is 250 nm, a maximum coupling efficiency of 73%, an insertion loss of -1.4 dB and an extinction ratio of 16 dB can be achieved at a coupling length of 4.5 mu m at 1.55 mu m wavelength. A particular feature of this hybrid coupler is that it is highly tolerant to the structural parameters of the plasmonic waveguide and the misalignment between the two waveguides. The performance of this hybrid coupler as a TM polarizer is also analyzed and a maximum extinction ratio of 44 dB and an insertion loss of -0.18 dB can be obtained. The application of this hybrid coupler includes the signal routing between plasmonic waveguides and dielectric waveguides in photonic integrated circuits and the polarization control between TE and TM modes. In addition, it provides an approach for efficiently exciting MIM plasmonic modes with conventional dielectric modes. (C) 2010 Optical Society of America
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6.
  • Liu, Fangfei, et al. (creator_code:aut_t)
  • Compact optical temporal differentiator based on silicon microring resonator
  • 2008
  • record:In_t: Optics Express. - 1094-4087. ; 16:20, s. 15880-15886
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We propose and experimentally demonstrate a temporal differentiator in optical field based on a silicon microring resonator with a radius of 40 mu m. The microring resonator operates near the critical coupling region, and can take the first order derivative of the optical field. It features compact size thus is suitable for integration with silicon-on-insulator (SOI) based optical and electronic devices. The performance of this optical differentiator is tested using signals with typical shapes such as Gaussian, sinusoidal and square-like pulses at data rates of 10 Gb/s and 5 Gb/s.
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7.
  • Song, Yi, et al. (creator_code:aut_t)
  • Broadband coupler between silicon waveguide and hybrid plasmonic waveguide
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:12, s. 13173-13179
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Efficient broadband coupling of light between a dielectric waveguide and a hybrid plasmonic waveguide is investigated theoretically. A plasmonic linear taper is used as a coupler which connects the two types of waveguides. Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4 mu m, which achieves a coupling efficiency of 70% (1.5dB) at the 1.55 mu m telecommunication wavelength. (C) 2010 Optical Society of America
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8.
  • Song, Yi, et al. (creator_code:aut_t)
  • Broadband coupler between silicon waveguide and hybrid plasmonic waveguide
  • 2010
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 18:12
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Efficient broadband coupling of light between a dielectric waveguide and a hybrid plasmonic waveguide is investigated theoretically. A plasmonic linear taper is used as a coupler which connects the two types of waveguides. Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4μm, which achieves a coupling efficiency of 70% (1.5dB) at the 1.55μm telecommunication wavelength.
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9.
  • Tian, Jingyi, et al. (creator_code:aut_t)
  • Reconfigurable all-dielectric antenna-based metasurface driven by multipolar resonances
  • 2018
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 26:18, s. 23918-23925
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Dielectric nanoantenna-based metasurfaces have attracted wide attention for their outstanding performance in light manipulation with low loss and full phase coverage enabled by multipolar resonances. To make the metasurfaces actively tunable, we adopt a kind of phase-changing material Ge2Sb2Te5 to construct non-volatile, switchable antenna-based metasurfaces in the mid-infrared spectrum region. Our design of the metasurface can realize switching between electric and magnetic dipole resonances across a broad spectrum region through crystalline-amorphous phase transitions under fixed design. Moreover, the transmission switching contrast between different phases can be up to 30dB (-30dB), due to the shift of multipolar resonances. This reconfigurable antenna-based metasurface will pave the way for ultimate design of light modulators, deflectors, holograms and so on for future optical communication networks.
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10.
  • Wang, Qing, et al. (creator_code:aut_t)
  • Hybrid photonic-plasmonic molecule based on metal/Si disks
  • 2013
  • record:In_t: Optics Express. - 1094-4087. ; 21:9, s. 11037-11047
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Optical properties of two identical coupled disks forming a "hybrid photonic-plasmonic molecule" are investigated. Each disk is a metal-dielectric structure supporting hybrid plasmonic-photonic whispering-gallery (WG) modes. The WG modes of a molecule split into two groups of nearly-degenerate modes, i.e., bonding and anti-bonding modes. The oscillation of quality factor (Q) with the inter-disk gap d and significant enhancement at certain inter-disk gaps can be observed. An enhanced Q factor of 1821 for a hybrid photonic-plasmonic molecule composed of two 1.2 mu m-diameter disks, compared with that for a single disk, is achieved. The corresponding Purcell factor is 191, making the hybrid photonic-plasmonic molecule an optimal choice for subwavelength-scale device miniaturization and light-matter interactions. Moreover, the far-field emission pattern of the hybrid photonic-plasmonic molecule exhibits an enhanced directional light output by tuning the azimuthal mode number for both bonding and anti-bonding modes.
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