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Sökning: L773:1094 4087 > He Sailing

  • Resultat 1-10 av 76
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1.
  • Ao, Xianyu, et al. (författare)
  • Two-stage design method for realization of photonic bandgap structures with desired symmetries by interference lithography
  • 2004
  • Ingår i: Optics Express. - 1094-4087. ; 12:6, s. 978-983
  • Tidskriftsartikel (refereegranskat)abstract
    • Interference lithography for the fabrication of photonic crystals is considered. A two-stage design method for realization of photonic bandgap structures with desired symmetries is developed. An optimal photonic crystal with a large bandgap is searched by adjusting some parameters while keeping some basic symmetry of the unit cell unchanged. A nonlinear programming method is then used to find the optimal electric field vectors of the laser beams and realize the desired interference pattern. The present method is useful for a rational and systematical design of new photonic bandgap structures.
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2.
  • Cai, Yangjian, et al. (författare)
  • Propagation of various dark hollow beams in a turbulent atmosphere
  • 2006
  • Ingår i: Optics Express. - 1094-4087. ; 14:4, s. 1353-1367
  • Tidskriftsartikel (refereegranskat)abstract
    • Propagation of a dark hollow beam (DHB) of circular, elliptical or rectangular symmetry in a turbulent atmosphere is investigated. Analytical formulas for the average intensity of various DHBs propagating in a turbulent atmosphere are derived in a tensor form based on the extended Huygens-Fresnel integral. The intensity and spreading properties of the DHBs in a turbulent atmosphere are studied numerically. It is found that after a long propagation distance a dark hollow beam of circular or non-circular eventually becomes a circular Gaussian beam (without dark hollow) in a turbulent atmosphere, which is much different from its propagation properties in free space. The conversion from a DHB to a circular Gaussian beam becomes quicker and the beam spot in the far field spreads more rapidly for a larger structure constant, a shorter wavelength, a lower beam order and a smaller waist size of the initial beam.
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4.
  • Chen, D. R., et al. (författare)
  • Band-rejection fiber filter and fiber sensor based on a Bragg fiber of transversal resonant structure
  • 2008
  • Ingår i: Optics Express. - 1094-4087. ; 16:21, s. 16489-16495
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose a novel band-rejection fiber filter based on a Bragg fiber of transversal resonant structure, which can also be used as a fiber sensor. Defect layers are introduced in the periodic high/low index structure in the cladding of the Bragg fiber. Coupling between the core mode and the defect mode results in large confinement loss for some resonant wavelengths inside the band gap of the Bragg fiber. A segment of the Bragg fiber of transversal resonant structure can be used as a band-rejection fiber filter, whose characteristics are mainly determined by the defect layer. The loss peak wavelength of the Bragg fiber is dependent on the refractive index and the thickness of the defect layer which indicates its applications of refractive index and strain sensing.
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5.
  • Chen, Rui-Pin, et al. (författare)
  • Vectorial effect of hybrid polarization states on the collapse dynamics of a structured optical field
  • 2016
  • Ingår i: Optics Express. - : The Optical Society. - 1094-4087. ; 24:24, s. 28143-28153
  • Tidskriftsartikel (refereegranskat)abstract
    • The collapse dynamics of a structured optical field with a distribution of spatially-variant states of polarization (SoP) and a spiral phase in the field cross section is studied using the two-dimensional coupled nonlinear Schrodinger equations. The self-focusing of a structured optical field with an inhomogeneous SoP distribution can give rise to new phenomena of collapse dynamics that is completely different from a scalar field. The collapse patterns are closely related to the topological charges of the vortexas well as the polarization, the initial power, and the SoP distribution in the field cross section. A single on-axis collapse or multiple off-axis partial collapses may occur due to the self-focusing effects of linearly, elliptically and circularly polarized components located at different positions of the field cross-section. The polarization in the core of the collapsing beam is always linearly polarized. The structured collapsing beams, which are driven by the vortex, propagate along a spiral trajectory in a saturated medium.
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6.
  • Chen, Tuo, et al. (författare)
  • Frequency-tunable circular polarization beam splitter using a graphene-dielectric sub-wavelength film
  • 2014
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 22:16, s. 19748-19757
  • Tidskriftsartikel (refereegranskat)abstract
    • Manipulating the circular polarization of light is of great importance in chemistry and biology, as chiral molecules exhibit different physiological properties when exposed to different circularly polarized waves. Here we suggest a graphene/dielectric-stacked structure, which has both the properties of an epsilon-near-zero material and the high Hall conductivity of graphene. The proposed sub-wavelength structure demonstrates efficient manipulation of circular polarization properties of light. In a quite broad frequency range and at a large oblique incidence angle, the present magnetically active structure is transparent for one circularly polarized wave, and opaque for another. Such an effect can be further tuned by changing the magnitude of the applied magnetic field and chemical potential of graphene.
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9.
  • Cui, Y. X., et al. (författare)
  • A theoretical re-examination of giant transmission of light through a metallic nano-slit surrounded with periodic grooves
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:16, s. 13995-14000
  • Tidskriftsartikel (refereegranskat)abstract
    • We show that the slit-to-groove distance for a maximal transmission through the nano-slit surrounded with periodic grooves cannot be predicted by the theory of constructive interference between the groove-generated surface plasmon wave (SPW) and the incident wave. A clear physical explanation is given for the dependence of the transmission on the slit-to-groove distance. It is shown that the influence to the transmission comes from three parts: the groove-generated SPW, the incident wave and the nano-slit-generated SPW. The groove-generated SPW is the main factor determining the local field distribution around the nano-slit opening. The influence of the incident wave is very weak when strong SPW is generated on the input surface by many periods of deep grooves. The nano-slit-generated SPW can also be considered as a disturbance to the light distribution on the input surface.
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10.
  • Dai, Daoxin, et al. (författare)
  • A silicon-based hybrid plasmonic waveguide with a metal cap for a nano-scale light confinement
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:19, s. 16646-16653
  • Tidskriftsartikel (refereegranskat)abstract
    • A hybrid plasmonic waveguide with a metal cap on a silicon-on-insulator rib (or slab) is presented. There is a low-index material nano-layer between the Si layer and the metal layer. The field enhancement in the nano-layer provides a nano-scale confinement of the optical field (e. g., 50nm x 5nm) when operates at the optical wavelength lambda = 1550nm. The theoretical investigation also shows that the present hybrid plasmonic waveguide has a low loss and consequently a relatively long propagation distance (on the order of several tens of lambda).
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  • Resultat 1-10 av 76

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