Zero order anomaly of dielectric coated gratings

Mashev, L.; Popov, Evgeny

doi:10.1016/0030-4018(85)90134-8

Cited by 199 publications

(66 citation statements)

References 3 publications

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“…Such resonances, being Fano-type discrete states in the continuum background, are characterized by a finite frequency linewidth due to radiative losses even in transparent materials. The existence of radiative losses seems to exclude a possibility of full reflectivity, however, all the models [11,14,22,23,24,25] show this effect in transparent PCS. Moreover, it appears that very different physical models, with only one common thing, the existence of any resonance, predict a qualitatively similar behavior of the PCS optical response, see, e.g., discussions in [14,18,26,27].…”

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confidence: 91%

Optical properties of photonic crystal slabs with an asymmetrical unit cell

2005

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Using the unitarity and reciprocity properties of the scattering matrix, we analyse the symmetry and resonant optical properties of the photonic crystal slabs (PCS) with complicated unit cell. We show that the reflectivity is not changed upon the 180 • -rotation of the sample around the normal axis, even in PCS with asymmetrical unit cell. Whereas the transmissivity becomes asymmetrical if the diffraction or absorption are present. The PCS reflectivity peaks to unity near the quasiguided mode resonance for normal light incidence in the absence of diffraction, depolarisation, and absorptive losses. For the oblique incidence the full reflectivity is reached only in symmetrical PCS.PACS numbers: 42.70. Qs, 42.25.Bs The physics of photonic crystal slabs (PCS) [1,2,3] receives much attention in recent years because of many interesting possibilities they open to control the light interaction with matter. The tendency is toward the PCS sophistication: nanostructured metals or semiconductors are included, and the unit cell geometry, using modern technology, becomes more complicated. As a result, new tools for photonic engineering become available. A well known example is the extraordinary optical transmission through sub-wavelength hole arrays in metal films [4,5]. Another promising example are polaritonic crystal slabs with nanostructured semiconductors [6,7,8]. The physics behind is the coupling between photonic and different electronic resonances in such structures. They manifest themselves via pronounced resonant Wood's anomalies [9,10,11] in the optical spectra, due to the excitation of quasiguided [2,3,12,13,14,15] or surface plasmon [4,16,17,18] or both [19] modes. On the other hand, making complicated unit cells, e.g., characterized by a lack of 180 o -rotational symmetry in the PCS plane [17,20] adds new ways to control the interaction with light.Thus, the understanding of the symmetry and resonance properties of the optical response in PCS with a complicated unit cell becomes important, also for their optical characterization. Measuring reflection from asymmetric structure appears to be not a promising method for the PCS optical characterization, and a question arises, which optical properties are more sensitive to the PCS structure? Meanwhile, notwithstanding a long history of the investigations (see, e.g., in [11,21]), starting actually from the optical gratings, which can be understood as one-dimensional (1D) PCS, their properties look sometime amazing and even contradictory.One example is the nontrivial symmetry properties of reflection and transmission from asymmetric PCS. Namely, it was demonstrated [17] experimentally and numerically that the reflectivity from 180 o -rotationally non-invariant (in the PCS plane) metal gratings on a dielectric substrate is always symmetric, whereas the transmission is not. However, the transmission appears to be independent on the side of the illumination, whether it is from the air or from the substrate (see also in Refs. 4, 5). The authors [17] find this astonishing...

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confidence: 91%

Optical properties of photonic crystal slabs with an asymmetrical unit cell

2005

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“…28) of such photonic resonances are often caused by the so-called guided resonance modes (GRMs) 22,23,29 . The spectrally narrow linewidth of these modes originates from the suppression of their radiative losses through the long-range destructive interference between multiple unit cells of a photonic crystal and, therefore, is extremely sensitive to the light's incidence angle 22,24,25,28,30,31 . Such angular sensitivity prevents miniaturization of photonic crystal devices 22,26,32 and imposes severe restrictions on the angular divergence of the incident light beams.…”

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confidence: 99%

Spectrally selective chiral silicon metasurfaces based on infrared Fano resonances

et al. 2014

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Metamaterials and metasurfaces represent a remarkably versatile platform for light manipulation, biological and chemical sensing, and nonlinear optics. Many of these applications rely on the resonant nature of metamaterials, which is the basis for extreme spectrally selective concentration of optical energy in the near field. In addition, metamaterial-based optical devices lend themselves to considerable miniaturization because of their subwavelength features. This additional advantage sets metamaterials apart from their predecessors, photonic crystals, which achieve spectral selectivity through their longrange periodicity. Unfortunately, spectral selectivity of the overwhelming majority of metamaterials that are made of metals is severely limited by high plasmonic losses. Here we propose and demonstrate Fano-resonant all-dielectric metasurfaces supporting optical resonances with quality factors Q4100 that are based on CMOS-compatible materials: silicon and its oxide. We also demonstrate that these infrared metasurfaces exhibit extreme planar chirality, opening exciting possibilities for efficient ultrathin circular polarizers and narrow-band thermal emitters of circularly polarized radiation.

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“…The segmented grating acts as a frequency-selective mirror based on the resonant reflection [8] which results from destructive interferences taking place in the device. Under coupling condition (1), part of the incident beam is directly transmitted through the device (t in Fig.…”

Section: Principles and Theoretical Approachmentioning

confidence: 99%

Grating Diffraction Effects in the THz Domain

et al. 2005

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We study the far infrared electromagnetic response of grating devices by THz time-domain spectroscopy. We first show that THz waves are efficiently injected into silicon waveguides using grating couplers. Moreover, changing the waveguide material parameters by white-light illumination allows us to strongly modify the coupling efficiency. Then we demonstrate resonant effects in segmented grating structures that act as perfect mirrors at selected wavelengths even for focused beams. About 10 periods of the grating participate in the phenomenon, nevertheless the resonance frequency width of the device remains narrow. This collection of experiments shows that millimeter-size mock-ups and THz waves can be effectively used to extrapolate the optical response of micron-size actual devices.

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Zero order anomaly of dielectric coated gratings

Cited by 199 publications

References 3 publications

Optical properties of photonic crystal slabs with an asymmetrical unit cell

Optical properties of photonic crystal slabs with an asymmetrical unit cell

Spectrally selective chiral silicon metasurfaces based on infrared Fano resonances

Grating Diffraction Effects in the THz Domain

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