Quasiperiodic photonic crystals for filtering purpose by means of the n doped semiconductor material

Abstract

We investigated the transmittance properties of the one dimensional quasiperiodic photonic crystals that contains an n doped semiconductor material. Our study is mainly based on the theoretical framework of the plasma model and the characteristic matrix method. Here, Fibonacci sequence represents the core axis in the design of our structure. Therefore, this design could be named as Fibonacci based structure. The numerical results are mainly based on the variation of the doping concentration. This parameter could be crucial in the tunability of the photonic band gaps. The effect of many parameters such as the thickness of the semiconductor material, the sequence number and the type of the sequence are demonstrated. The designed structure is prepared to act as a multichannel filter for THz applications.

Hybrid Tamm plasmon resonance excitation towards a simple and efficient biomedical detector of NaI solution

“…35,61 Usually, the appearance of more than one peak or dip is preferred in applications like filters and multiplexers. 7,12,15 However, in applications like sensors, it is highly desirable for any design to adjust one peak as an indicator for the input parameter rather than two or more peaks. In addition, when the spectrum shows two peaks, sometimes this makes a conflict in determining which one is related to the change of the input parameter (like concentration, temperature, etc.…”

“…Fig. 1 The suggested design of NaI sensor that constituted as, {prism/Ag/cavity/(GaN/CaF 2 ) 15 /air substrate}.…”

“…[48][49][50] Controlling the thickness of the layers during the fabrication process of the proposed sensor is a very important point for any sensor design. For the fabrication of the design, prism/Ag/cavity/(GaN/CaF 2 ) 15 /air layers, an ultra-smooth Ag layer is deposited on the prism by using the thermal evaporation technique. 51 Then, a polyimide polymer lm is prepared on the prism/Ag by polymerization of the m-phenylenediamine monomer.…”

“…11,12 Thus, the appearance of the PBGs and photon localization grants PCs more sparkle to be the mainstay in many different applications. PCs are designed and fabricated for optical switches and reectors, [13][14][15] communication systems, 16,17 camouage, 18 renewable energy and solar cells, [19][20][21][22][23][24][25] and chemical, physical, and biomedical sensors. [26][27][28][29][30][31][32] However, the transmittivity of PC structures including resonant peaks has a limited response to the variations of some physical, chemical, or biological parameters like temperature, pressure, and concentration.…”

“…Then, the suggested design is enclosed by a prism on its top surface to enhance the total reection through the design and a substrate from the air on its bottom surface. Therefore, the proposed sensing tool is constituted as, {prism/Ag/cavity/(GaN/CaF 2 ) 15 / air}. The essential foundation of this study is based on the displacement of TP resonance modes by changing the aqueous NaI concentrations through the cavity layer.…”