Resonance effects in a dielectric grating; total absorption of electromagnetic waves by a dielectric grating on metal system

Fitio, Volodymyr; Bobitski, Yaroslav

doi:10.1088/1464-4258/6/10/004

Cited by 34 publications

(42 citation statements)

References 28 publications

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“…It is evident that such waveguide will be have a attenuation at wave propagation due to absorption by metal. As the calculations are shown 25 , the determined parameters are enough closed to full absorption parameters, especially, at low modulation of grating permittivity. Here it should be remarked that for TM-polarized waves the more variants of full absorption exist.…”

Section: Parameters Of the System The Dielectric Grating On Metal At mentioning

confidence: 92%

“…This phenomenon can be explained by appearance of coupled waves resonance 25 in waveguide formed by grating and metal surface. The field resonance phenomenon can be confirmed both the dependence of absorption on wavelength, which described by Lorentz function, and the so-called increase of field in grating 25 . The periodic structures, both one-dimensional and twodimensional, which include the metallic film, possess by interesting properties.…”

Section: Introductionmentioning

confidence: 97%

“…In second part the parameters of full absorption in the system of dielectric grating on metal, which obtain in works 24,25 , and data calculated within this work, are shown. These full absorption system parameters serve as input data for finding of parameters with anomalous high transmission by searching.…”

Section: Introductionmentioning

confidence: 99%

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<title>Transmission peculiarities of dielectric layer/thin metallic film/dielectric layer structure, with or without periodicity in the dielectric layers</title>

Fitio

Bobitski

2008

SPIE Proceedings

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The transmission characteristics of the dielectric grating -thin metal film -dielectric grating structure have been analyzed by the coupled wave method (CWM). The analysis is conducted for waves of TE and TM polarizations. The qualitative transmission characters are similar for two polarizations, but are different quantitatively. The reflectance of such structure can be higher than 0.85 on wavelength of 1.5µm at certain parameters for a silver film with thickness of 0.0385µm. The reflectance on the wavelength of the maximum transmission is actually equal to zero. The only thin film without gratings on the same wavelength has the transmittance of 0.004 and reflectance of 0.984. The system, which consists of grating from metal included between homogeneous dielectrics, also possesses by anomalous high transmission. At that the transmission is substantially higher than a ratio of a metal-free space to the grating period. Similar dependences can be obtained for a structure, in which the thin film of metal is located between two layers of dielectric with high refraction index. At certain conditions the reflection is less than 0.0002 and transmission is more than 0.87 for the metal thickness of 0.0385 µm. The rule is found, which is enable to find approximately the parameters for these high transmission structures. This effect is explained by the coupled wave resonance with forming of a wave node within the thin metal film that minimizes absorption.

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Section: Parameters Of the System The Dielectric Grating On Metal At mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 97%

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<title>Transmission peculiarities of dielectric layer/thin metallic film/dielectric layer structure, with or without periodicity in the dielectric layers</title>

Fitio

Bobitski

2008

SPIE Proceedings

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“…Subwavelength structures are very important in tailoring light propagation in the telecom spectral band by modifying the transmission, reflection, absorption and polarization. Subwavelength structures have extensive applications in optoelectronic device [2] , optical filters [3][4][5][6] , optical switch [7] , negative refraction materials [8] and so on. The combination of the surface plasmon polartions (SPPs) and the photophysical properties of the photonic devices may produce new characteristics and used to explore new applications.…”

Section: Introductionmentioning

confidence: 99%

Dual band filter based on subwavelength metal grating with groove caved in and waveguide layer below

Liang

Xie

et al. 2014

SPIE Proceedings

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Interactions between different resonance modes in optoelectronic structures may introduce coupled modes that can be utilized to explore special optical functions that cannot be realized by conventional methods. A novel dual band filter based on sub-wavelength metal grating with groove caved in and waveguide layer below is proposed in this paper. The metal grating is caved with a groove in the middle of every metal trip, and a waveguide layer with higher refractive index is placed between the metal grating and glass substrate. Using the finite-difference time-domain (FDTD) method, we research the implied physical mechanism by investigating the transmission spectrum with the changing of the structural parameters and the electromagnetic field distributions at some specific wavelengths, such as peaks and valleys in the transmittance. In our simulation, we chose Ag as the grating material and Drude-Lorentz model is employ to describe the dielectric constant. It is found that the two resonance bands are determined by different structural parameters, which due to different mechanism, FP resonance and waveguide resonance, and we also take the groove cavity mode into account when the standing wave oscillates in the groove and result in the dips between two peaks. Besides, the most notable of these features is that the increase of the grating height doesn't shift these two resonance wavelength at all, and groove parameters only move the first peak wavelength regularly, which could be an excellent candidate for dual band filter in the telecom wavelengths. Our proposed structure with subwavelength may provide potential applications in optoelectronic devices.

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“…The Periodic structures, which include the metallic thin films [2,3], are investigated by this method. These periodic structures have either anomalous high transmission [2] or full (resonance) absorption [3] or other interesting features. In this work the results of investigations of the periodic structure which is depicted in fig.…”

Section: Introductionmentioning

confidence: 99%

High transmission of system "dielectric grating thin metal film - dielectric grating"

Fitio

Bobitski

Proceedings of LFNM 2005. 7th International Conference on Laser and Fiber-Optical Networks Modeling, 2005.

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The analysis of transmission of system the dielectric grating-metal thin film-dielectric gratingsubstrate by the coupled wave method (CWM) is conducted. It is revealed that at certain parameters the system has the anomalous high transmittance and practically zero reflectance on defined wavelengths. For example, the silver film with thickness of 0.0385gm placed between two gratings with certain parameters transmit more than 0.86 and 0.83 corresponding to TE and TM polarizations on wavelength of 1.5gm. The silver film in vacuum with same thickness has the reflectance higher than 0.98 and transmittance less than 0.004. Transmission sharply drops at deviation of the wavelength from the defined value. The system the dielectric with high refraction coefficient-metallic thin film-dielectric with high refraction coefficient has the analogous spectrum characteristics.

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Resonance effects in a dielectric grating; total absorption of electromagnetic waves by a dielectric grating on metal system

Cited by 34 publications

References 28 publications

<title>Transmission peculiarities of dielectric layer/thin metallic film/dielectric layer structure, with or without periodicity in the dielectric layers</title>

<title>Transmission peculiarities of dielectric layer/thin metallic film/dielectric layer structure, with or without periodicity in the dielectric layers</title>

Dual band filter based on subwavelength metal grating with groove caved in and waveguide layer below

High transmission of system "dielectric grating thin metal film - dielectric grating"

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