Sensitivity analysis for detecting chemicals by the optical chemical sensor based Photonic Crystal Fiber (PCF) in the Terahertz (THz) regime

2021 ◽  
Author(s):  
Selim Hossain ◽  
Omar Faruq ◽  
Md. Masud Rana ◽  
Shuvo Sen ◽  
Md. Dulal Haque ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensor ◽  
Relative Sensitivity ◽  
Perfectly Matched Layers ◽  
Industrial Chemicals ◽  
Optical Chemical Sensor ◽  
Crystal Fiber ◽  
Research Article ◽  
Matched Layers

Abstract This research article demonstrates a good simulation result for identifying and detecting various industrial chemicals in a Terahertz (THz) waveguide with a new heptagonal, five layers of heptagonal photonic fiber elliptic form, heptagonal clading shape (H-PCF). COMSOL 4.2 software based on finite element (FEM) methods and perfectly matched layers check our composition (PML). The different chemicals are also differentiated and identified by each other in different parameters H-PCF fibers show a high relative sensitivity of ethanol of approximately 86.50 percent after numerical analysis, Benzene around 89.35%, and water around 85.15% at a frequency of around 0.7 THz. In our experiment, we obtained very low confinement losses at 1 terahertz (THz) such as 5.95×10−08 dB/m for Ethanol 6.67×10−08 dB/m for Benzene, and 5.80×10−08 dB/m for water. Regarding these results, we can strongly recommend that our proposed heptagonal photonic crystal fiber (H-PCF) will be more congenial in biomedical, bio-medicine, and industrial areas for the identification and detection of various types of chemicals with the help of a THz waveguide.

Effect of plasmonic materials on photonic crystal fiber based surface plasmon resonance sensors

2019 ◽  
Vol 33 (13) ◽  
pp. 1950157 ◽  
Author(s):  
Ahmet Yasli ◽  
Huseyin Ademgil
Keyword(s):  
Surface Plasmon Resonance ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Resonance Condition ◽  
Sensitivity Analyses ◽  
Perfectly Matched Layers ◽  
Crystal Fiber ◽  
Matched Layers

In this study, we proposed photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor with gold, bimetallic silver-gold and silver-graphene as active plasmonic layers. Proposed PCF structure with surrounded outer shell of two large analyte channels are studied with spectral interrogation method. Full vectorial Finite Element Method (FV-FEM) with Perfectly Matched Layers (PML) are assigned to investigate the resonance condition, resolution and sensitivities of proposed structures. According to spectral sensitivity analyses, maximum sensitivity reached up to 3000 nm/RIU for gold, 3500 nm/RIU for gold-covered silver and 4000 nm/RIU for graphene-covered silver. Meanwhile, the average sensitivities are around 2850 nm/RIU, 2650 nm/RIU and 3750 nm/RIU for gold, gold-covered silver and graphene-covered silver, respectively.

scholarly journals A Highly Birefringent Photonic Crystal Fiber for Terahertz Spectroscopic Chemical Sensing

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1799
Author(s):  
Tianyu Yang ◽  
Liang Zhang ◽  
Yunjie Shi ◽  
Shidi Liu ◽  
Yuming Dong
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensing ◽  
Numerical Aperture ◽  
Wide Band ◽  
Relative Sensitivity ◽  
Chemical Sensitivity ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Polarization Maintaining

A photonic crystal fiber (PCF) with high relative sensitivity was designed and investigated for the detection of chemical analytes in the terahertz (THz) regime. To ease the complexity, an extremely simple cladding employing four struts is adopted, which forms a rectangular shaped core area for filling with analytes. Results of enormous simulations indicate that a minimum 87.8% relative chemical sensitivity with low confinement and effective material absorption losses can be obtained for any kind of analyte, e.g., HCN (1.26), water (1.33), ethanol (1.35), KCN (1.41), or cocaine (1.50), whose refractive index falls in the range of 1.2 to 1.5. Besides, the PCF can also achieve high birefringence (∼0.01), low and flat dispersion, a large effective modal area, and a large numerical aperture within the investigated frequency range from 0.5 to 1.5 THz. We believe that the proposed PCF can be applied to chemical sensing of liquid and THz systems requiring wide-band polarization-maintaining transmission and low attenuation.

scholarly journals A Highly Sensitive, Polarization Maintaining Photonic Crystal Fiber Sensor Operating in the THz Regime

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 40 ◽  
Author(s):  
Sohel Rana ◽  
Nirmala Kandadai ◽  
Harish Subbaraman
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
High Sensitivity ◽  
Relative Sensitivity ◽  
Computational Technique ◽  
The Finite Element Method ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Highly Sensitive ◽  
Imaging And Spectroscopy

In this paper, a high sensitivity, polarization preserving photonic crystal fiber (PCF), based on circular air holes for sensing in the terahertz (THz) band, is presented. The finite element method, a practical and precise computational technique for describing the interactions between light and matter, is used to compute the modal properties of the designed fiber. For the designed PCF, comprising of circular air holes in both the cladding and in the porous core, a relative sensitivity of 73.5% and a high birefringence of 0.013 are achieved at 1.6 THz. The all circular air-hole structure, owing to its simplicity and compatibility with the current fiber draw technique for PCF fabrication, can be realized practically. It is anticipated that the designed fiber can be employed in applications such as detection of biological samples and toxic chemicals, imaging, and spectroscopy.

Quasi-Photonic Crystal Fiber-Based Spectroscopic Chemical Sensor in the Terahertz Spectrum: Design and Analysis

2018 ◽  
Vol 18 (24) ◽  
pp. 9948-9954 ◽  
Author(s):  
Bikash Kumar Paul ◽  
Kawsar Ahmed ◽  
Dhasarathan Vigneswaran ◽  
Fahad Ahmed ◽  
Subrata Roy ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensor ◽  
Crystal Fiber ◽  
Terahertz Spectrum ◽  
Spectrum Design

Porous core Photonic Crystal Fiber based chemical sensor

2016 ◽  
Author(s):  
Bikash Kumar Paul ◽  
Md. Shadidul Islam ◽  
Sawrab Chowdhury ◽  
Sayed Asaduzzaman ◽  
Kawsar Ahmed
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensor ◽  
Crystal Fiber ◽  
Porous Core

TOPAS based porous core photonic crystal fiber for terahertz chemical sensor

Optik ◽  
2020 ◽  
Vol 223 ◽  
pp. 165562
Author(s):  
Vijay Shanker Chaudhary ◽  
Dharmendra Kumar
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensor ◽  
Crystal Fiber ◽  
Porous Core

Sensing of Illegal Drugs by Using Photonic Crystal Fiber in Terahertz Regime

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Shaymaa Riyadh Tahhan ◽  
Hadeel K. Aljobouri
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Relative Sensitivity ◽  
Confinement Loss ◽  
Crystal Fiber ◽  
The Core ◽  
Stimulant Abuse ◽  
Element Simulation ◽  
Effective Mode Area ◽  
Mode Area

AbstractStimulant abuse enhances dopamine release, thereby causing increased excitation. Any extent of stimulant abuse can considerably harm the user. Thus, methods of detecting stimulants must be precise, accurate, and reliable. A novel terahertz (THz) photonic crystal fiber with a Topas substrate is designed and rigorously investigated for detecting liquid amphetamine, cocaine, and ketamine. The fiber structure has a pentagonal shape and comprises circular air holes in the core and cladding spatial extents. As shown in finite element simulation, the proposed fiber yields a high relative sensitivity of approximately 80 % when any of the liquid stimulants is infiltrated in the core air holes. At 1 THz operating frequency, the proposed fiber produces a large effective mode area, negligible confinement loss, and extremely low bending and effective material losses. Other THz waveguiding properties, such as core power fraction and total loss, are also studied. Lastly, a positive and negative 2 % fabrication tolerance is set to ensure seamless potential practical realization of the fiber.

scholarly journals Design and Simulation of Exhaust Pollution Monitoring Sensor Based on Photonic Crystal Fiber

2019 ◽  
Vol 29 (3) ◽  
pp. 1
Author(s):  
Aseel I. Mahmood ◽  
Shehab A. Kadhim ◽  
Nadia F. Muhammad
Keyword(s):  
Air Pollution ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Transmission Band ◽  
Living Organism ◽  
Relative Sensitivity ◽  
Pollution Monitoring ◽  
Potential Candidate ◽  
Exhaust Gases ◽  
Crystal Fiber

Many critical issues appear due to the exhaust gases from transportations facilities, electric generators, industries, and so on. This lead to air pollution, which could be define as an introduction of biological materials or chemicals that’s causes harm to all living organism including humans. Also damaging the environment of earth. The principal gases that cause air pollution from these sources are nitrogen oxides (NO, NO2 and N2O) and carbon oxides (CO and CO2). There is a need to develop sensors that are characterized by highly-sensitive and miniaturize that capable of real-time analyses detection; optical fiber sensors agree with these needs. In this work, Large Mode Area- Polarization Maintaining Photonic Crystal Fiber (LMA-PM-PCF) for exhaust gases monitoring have been proposed to detect air-polluted gases over a wide transmission band covering (1µm) to (2µm) wavelength. Different guiding properties had been studied for the infiltrated PCFs. According to simulated results, the high relative sensitivity is obtained for sample infiltrated with CO gas; The higher sensitivity makes this fiber a potential candidate to detect CO that is commonly known as silent killer.

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