Comparative Study of the One Dimensional Dielectric and Metallic Photonic Crystals (original) (raw)
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In this study, we have theoretically investigated transmission properties of transverse electric fields at visible region frequencies in one dimensional defect Metallic-Dielectric photonic crystals. We examined the effect of photonic crystals thickness, layer numbers, layer refractive indexes and defects on transparency. We use OptiFDTD software for simulations. OptiFDTD software uses finite-different time-domain method.
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Journal of Computational and Theoretical Nanoscience, 2011
Based on the transfer matrix method (TMM), we have studied theoretically the interaction of electromagnetic waves with one dimensional photonic crystal (1DPc) in NIR frequency regions. We have calculated the transmission characteristics in this wavelength domain, and we have obtained that the transmission values had been strongly affected by the angle of incidence and the state of polarizations. The effect of Brewster's angle had been considered, which leads to some modifications in the transmission response.
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We report the omnidirectional reflection (ODR) in one dimensional photonic crystal (PC) structure consisting of alternate layers of Cryolite (Na 3 AlF 6 ) as material of low refractive index and Germanium (Ge) as material of high refractive index. The effects of the thickness of layers and incidence angles on the spectral reflectance have been investigated using transfer matrix method (TMM). The proposed structure gives 100% reflection within a wide range of wavelengths in the visible-near IR region (600 nm- 850 nm) which can be tuned according to the design parameters. We observe that cryolite based photonic crystal structure can be used as a good candidate for wavelength filter or broad reflector in the near infrared spectrum which is very useful in many imaging sensors in the field of optical technology.
Complex dispersion relation of 1D dielectric photonic crystal with thin metallic layers
Microelectronics …, 2009
We have carried out the analytical and numerical analysis of metallic insets embedded in a dielectric photonic crystal (DPC). The corresponding one-dimensional metallo-dielectric photonic crystal (MDPC) is studied in relation to the substratum DPC. We describe the complex MDPC dispersion relation curves and the transmission coefficient at the different propagation regimens trough the finite stack. While in the DPC, the band gap argument corresponds to undefined complex solutions of a real dispersion relation, in a MDPC corresponds to a definite complex solution, function of the metal thickness; and analytic continuation of the dispersion curve on the imaginary K plane. The metal absorption is described by the Drude model, and as a result of the absorption in the inset metallic films, complex Bloch vectors are produced for all frequencies as evanescent waves that differ from the straightforward metal absorption.
Electromagnetic Wave Propagation Characteristics in a One-Dimensional Metallic Photonic Crystal
Journal of Nonlinear Optical Physics & Materials, 2008
We theoretically studied electromagnetic wave propagation in a one-dimensional metal/dielectric photonic crystal (1D MDPC) consisting of alternating metallic and dielectric materials by using the transfer matrix method. We performed numerical analyses to investigate the propagation characteristics of a 1D MDPC. We discuss the details of the calculated results in terms of the electron density, the thickness of the metallic layer, different kinds of metals, and the plasma frequency.
Photonic Crystals Transmission Phenomena
Light travelling through a slab made of a photonic material is expected to decay exponentially if its frequency lies within a bandgap. Numerical calculations as well as experiments show that sometimes a more complex behaviour occurs: The field inside the crystal may decay bi-exponentially or show saturation i.e. a small part of the incoming field is transmitted without attenuation. These propagation properties can be explained by a generic model which is solved analytically. The model medium consists of a separable dielectric function which is the sum of two one dimensional square well functions or trigonometric functions in two perpendicular directions.
Photonic Crystal Materials and Devices II, 2004
Photonic crystal based structures have been considered for optical communication applications. A class of novel symmetric structures consisting of cavities and waveguides have been proposed to serve as optical add-drop multiplexers. Light transfer processes in these structures are analyzed briefly. The problem of deviating from the perfect accidental degeneracy is addressed for practical designs, and the backscattering intensities are shown low for the slight deviations. Anomalous light refraction at a surface of a photonic crystal has also been studied. The limitations of prior theoretical methods for the transmission problem are discussed. An outline of a new analytic theory that overcomes these limitations is presented. Photonic crystals are fabricated on polymer multi-layer films and integrated with conventional channel waveguides.