فهرس المقالات Optical filter

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  1 - Very compact photonic crystal resonant cavity for all optical filtering
  Hamed Seif-Dargahi Mahdi Zavvari Hamed Alipour-Banaei
  10.1007/s40094-014-0147-3
  AbstractIn this paper, an all-optical filter is proposed which employs a resonant cavity localized between input and output waveguides as wavelength selecting part of the filter. We study the impact of different parameters on the filtering of the structure using plane w أکثر

  AbstractIn this paper, an all-optical filter is proposed which employs a resonant cavity localized between input and output waveguides as wavelength selecting part of the filter. We study the impact of different parameters on the filtering of the structure using plane wave expansion and finite difference time domain methods. We also study the effect of the output waveguide position on the performance of the filter and results show that the proper position of the output waveguide is straight to the center of the resonant cavity. The initial form of filter is capable of selecting the optical waves at λ = 1,554.2 nm and the transmission efficiency of the filter is obtained about 100 %. The total footprint of the filter is تفاصيل المقالة
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  2 - Designing Tunable Optical Filter multi-Channel containing 1DDPC Structure
  Behnam Kazempour
  An electro-optic tunable single and multi-channel optical filter based on one-dimensional defective photonic crystal (1DDPC) structure is proposed. A couple of externally tunable defects in arrangement of (AB)5D1(BA)D2(BA)5, where A and B are dielectric materials, D1 an أکثر

  An electro-optic tunable single and multi-channel optical filter based on one-dimensional defective photonic crystal (1DDPC) structure is proposed. A couple of externally tunable defects in arrangement of (AB)5D1(BA)D2(BA)5, where A and B are dielectric materials, D1 and D2 are the tunable defects are used. The defects are composed of the ferroelectric LiNbO3 crystals and two pairs of thin Ag layers to make the voltage connections. With this arrangement it is possible to apply different external biases that facilitate the tunability and even more adjustability of the channel frequencies. Depending on the thickness of defect layers, a single or multi resonant peak can be induced inside the photonic band gap which can be employed to filter channels. About 37 nm (46 nm) of blue shift for 300 V and 37 nm (37 nm) of red shift for -300 V biases are observed without (and with) loss incorporation. An important and notable effect that happened was the dispersion loss of the structure due to metal layers is compensated by the negative biases. Our proposed structure can be good candidate to design an externally tunable optical filter and a voltage sensor with potential applications in all-optical signal processing and information communications fields. تفاصيل المقالة
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  3 - Optical Filter Based On Point Defects in 2D Photonic Crystal Structur
  آرزو مالکی
  In this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. In designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filte أکثر

  In this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. In designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filter. The initial form of this filter is capable of selecting optical waves at =1560 nm, the transmission efficiency of the filter is 100%. In designing and studying the optical properties of the filter, we used plane wave expansion and finite difference time domain methods. After designing the filter, we studied the impact of different parameters on the filtering behavior of the structure. The total footprint of the filter is less than 100 100 m2. Simplicity of design and ultra-compact dimensions are the most significant characteristics of our filter. تفاصيل المقالة
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  4 - The effect of cells' radius on optical filter output spectrum based on photonic crystals
  Jabraeil Farajzadeh Mir Mansur Ziabari
  In this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigate أکثر

  In this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigated. Currently, the most commonapplied mechanism for designing optical filter based on photonic crystals is using twomechanisms such as (a) The resonant cavities and (b) Ring resonators. The applied mechanism inoptical filter used in this article is the resonant cavities. In this filter, filtering act is operated byusing cavity located between output Waveguide and input waveguide and it has been used todesign filter at the first extracted band structure and we have applied forbidden band photonicbased-crystal by using PWE method. Then, the calculations related to filter output spectrum werecarried out by using an FDTD method. Thus, the effect of cells' radius on the behavior ofwavelength switching optical filter has been investigated in this study. تفاصيل المقالة
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  5 - The effect of inner ring radius on frequency and insertion loss of optical filters with ring resonator structure
  yagoob hasanzade Abdollah Alizadeh
  In this paper an optical filter having ring resonator structure with micro rings inside it, has been investigated. By variation the radius of main and inner rings, the variation of central frequency and insertion loss of filter in communication spectrum (1.5 µm to أکثر

  In this paper an optical filter having ring resonator structure with micro rings inside it, has been investigated. By variation the radius of main and inner rings, the variation of central frequency and insertion loss of filter in communication spectrum (1.5 µm to 1.6 µm) have been studied. By increasing the radius of main ring, the central frequency of filter move toward the lower frequencies, then central frequency of filter can be adjusted by the radius of main ring. Radius variation of main ring has not considerable effect in filter loss. Also, variation of inner ring’s radius, affects the filter insertion loss, and have a little displacement on the central frequency of filter. The maintained filter will have the minimum loss, when the inner rings radius have been selected equally 0.2 micrometer. By proper selection of radius sizes one can tune the filter precisely for desired resonance frequency and loss. تفاصيل المقالة