A multichannel filter based on ternary nano metallo-dielectric photonic crystal with Thue-Morse defect layer structure (original) (raw)
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Modeling of Multichannel Filter Using Defective Nano Photonic Crystal with Thue-Morse Structure
Progress in Electromagnetics Research Letters, 2017
In this work, we study a multichannel filter by using one-dimensional photonic crystal (1DPC) based on Thue-Morse sequence (TMS). We use a dielectric defect layer between binary sequence cells with a TMS structure. First, we show transmission in terms of wavelength for the structure without defect layers. Then, we plot transmission in terms of wavelength for a different number of defect layer periods (N) in normal incidence. The analysis shows that there are two photonic bang gaps (PBG) in visible and infrared regions and two defect modes in each one for N = 1. Moreover, the number of defect modes is increased by increasing N . So, by tuning them, this structure can be used as a multi-channel filter within an optical wavelength range.
Progress in Electromagnetics Research Letters, 2017
In this paper, we design an optical filter by using one-dimensional (1d) ternary metallodielectric photonic crystal (PC). We use a dielectric defect layer between ternary asymmetric cells with this structure (ABC)NDM (ABC)N and also increase the number of dielectric defect layers. Then, we plot transmission spectra in terms of wavelength and different angles of incidence in transverse electric (TE) and transverse magnetic (TM) polarizations. We show defect modes and photonic band gap (PBG) on the plane of wavelength and incident angles in both TE and TM polarizations. We also plot transmission in the lossless structure and compared loss and lossless structures. Furthermore, we compare dielectric defect layer with metallic defect layer in both TE and TM polarizations. Moreover, we plot symmetric structure (ABC)NDM (CBA)N in TE and TM waves. The theoretical analysis shows that there is one defect mode which moves to the shorter wavelength by increasing angles of incidence in asymmetri...
Important Effect of Defect Parameters on the Characteristics of Thue-Morse Photonic Crystal Filters
Advances in OptoElectronics, 2013
Design and characterization of optical filters based on photonic crystal Thue-Morse structures are theoretically examined using transfer matrix method. It is shown that by introducing defect layer in the original structure of the proposed filter, main characteristics of it are changed. The main advantage of this defect in Thue-Morse structure is its capability for DWDM communication applications. In other words, achievement of DWDM filter through the Thue-Morse photonic crystal structure is much easier. The desired wavelengths can be achieved by changing the defect parameter. High efficiency of the proposed filter is one of its benefits. The transmission efficiency of this structure is about 96% and the quality factor is more than 77000.
Physica B: Condensed Matter, 2015
The transmission spectrum properties of the one-dimensional ternary photonic crystal (1DTPC) structure, composed of dielectric (D), metal (M) and gain (G) materials, with three different arrangements of (DGM) N , (GDM) N and (DMG) N , where N is the number of periodicity, were investigated. Two full photonic band gaps and N-1 resonant peaks, localized between them, were observed on transmittance spectra on near-UV spectrum region. When the gained layer was placed in front of the metal, the peaks appeared with higher resolution. There is a peak, localized on the higher band-edge of the first gap, which shows very interesting property than the other peaks. Thus, it amplifies and compresses faster with increase in the N and strength of the gain coefficient. The effects of the gain coefficient and periodicity number are graphically illustrated. This communication presents a PC structure that can be a good candidate to design an amplifying and compressing single or multichannel optical filter in the UV-region.
International Journal of Nanoparticles
Photonic bandwidth of defected one-dimensional ternary photonic crystal is analytically calculated under both types of oblique incidences. Both P and S type polarised incidences on the structure are considered in order to compute transmittivity of the proposed Butterworth type bandpass filter, and passband spectrum is kept at 1,550 nm by suitably choosing structural parameters and defect density. Defect is kept within feasible limit, and ripple in the desired passband region is tailored by its controlled variation. Width of passband as function of defect density, angle of incidence and dimension of constituent layers is computed, and critical dimension for the sandwiched layer is predicted over which the structure will behave as equivalent binary one. For closely-spaced signal transmission, this narrow bandpass filter will work as excellent candidate to improve SNR.
Design of ultra-compact metallo-dielectric photonic crystal filters
Optics Express, 2005
Filter characteristics of metallo-dielectric photonic crystal slabs are analyzed using the Multiple Multipole Program combined with the Model-Based Parameter Estimation technique. This approach takes losses and material dispersion into account and provides highly accurate results at short computation time. Starting from this analysis, different ultra-compact band pass filters for telecommunication wavelengths are designed. The filters consist of five silver wires embedded in a waveguide structure. By applying stochastic and deterministic techniques the filter structures are optimized to obtain the desired characteristics.
DESIGN OF A TUNABLE OPTICAL FILTER BY USING A ONE DIMENSIONAL TERNARY PHOTONIC BAND GAP MATERIAL
A band pass filter with a linearly periodic refractive index profile is discussed in analogy with Kroning Penney model in band theory of solids. The suggested filter is a one-dimensional ternary periodic structure and provides better control in dispersion relation as compared to a binary structure because it has two more controlling parameters relative to those of the binary one. Since three layers are involved in the formation of band gaps a much broader range of dispersion control is obtained. Both refractive index modulation and optical thickness modulation are considered. A mathematical analysis is presented to predict allowed and forbidden bands of wavelength with variation of angle of incidence. It is also possible to get desired ranges of the electromagnetic spectrum filtered with this structure by manipulating the value of the lattice parameters.
A study of the asymmetric geometry based on a one-dimensional defective photonic crystal is reported. A common structure in the form of (HL) 4 L(HL) 4 is numerically investigated to be suitable for channel filters with broadband responses. The transmission characteristics, analysed by the Transfer Matrix Method (TMM), of the proposed structure in UV, VIS and IR ranges are clearly illustrated. A number of interesting features on the defect modes such as transmittance level, filtering frequency and the number of modes are observed when the defect layer thickness is adjusted. The results show a promising potential of the designed channel filter for various applications including the optical communication. I. INTRODUCTION Optical filter is a device for selectively transmitting light in a particular range of wavelengths while the other is blocked. Its widespread uses are found in various areas of interest such as nanotechnology [1-2], astronomy [3] and communication [4-7]. Designing is the first step in making an effective channel filter in many applications. Up to now, there are an increasing number of designed and developed filters to cover operating wavelengths from ultraviolet (UV) to terahertz (THz) wavelengths [4-14]. The one-dimensional photonic crystal (1D-PC) first introduced by Yablonovitch [15] and Sanjeev [16] has become a structure of choice to design a filter with good characteristics. 1D-PC is an artificial layered material with periodicity of different refractive indices and thicknesses [17]. 1D-PC can guide the flow of light passing through its structure. Principally, the existence of the photonic band gap (PBG) in PC prohibits a certain wavelength that falls within the PBG. Due to a simple structure, 1D-PC is the best candidate for a channel filter design with particular
Comparison of photonic crystal narrow filters with metamaterials and dielectric defects
IF = 1.5, 2010
The photonic band-gap of the two kinds of 1D photonic crystal structure which is composed of the form of (AB)N1Cm(BA)N2, one with a metamaterial defect layer (MDL) and the other one with a dielectric defect layer (DDL) are studied. Our results show that in both cases, where there is only one defect layer, m=1, no defect mode exists, but for two defect layers (m=2) there is a single defect mode which is centered in the middle of the band-gap. The width of the defect mode in DDL is narrower than that in MDL. For a number of defects of more than two (m>2) and even, in both of the MDL and DDL structures, there is only one defect mode. For m>2 and odd, the defect mode in the MDL vanishes, but for DDL there is two defect-mode symmetrically centered in the middle of the band-gap. The effects of the defect layers refractive index value, the periodicity number of the structures and the incident angle on the properties of the defect modes and the transmittance spectrum are discussed.
Transmission Properties of 1D Defect Metallic-Dielectric Photonic Crystals
2016
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.