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Showing papers in "Journal of optics in 2023"



Journal ArticleDOI
TL;DR: In this article , a planar coronavirus antenna is proposed for wide band applications, where the idea of the radiating part has been taken from the 3-D model of the virus, which is fed by a 50 Ω coplanar waveguide.
Abstract: In this paper, a novel compact planar coronavirus antenna is proposed for wide band applications. In the design of this antenna, the idea of the radiating part has been taken from the 3-D model of the coronavirus, which is fed by a 50 Ω coplanar waveguide. The patch structure and the feed line of the proposed antenna, which have been made of gold, are located on a polyamide substrate with a thickness and dielectric constant of 45 µm and 3.5, respectively, and the antenna has compact physical dimensions of 300 × 300 µm2. The simulation results of the antenna have been analyzed in terms of S11, VSWR, radiation pattern, gain and surface current distribution. The designed antenna covers the frequency band from 0.3627 to 0.5918 THz for S11 ≤ − 0 dB with a fractional bandwidth of > 47.98% and with a bandwidth ratio of 1.63:1. This extended bandwidth coverage allows the antenna to be suitable for a wide range of applications including wireless communications, internet of things, wearable devices, on-chip antennas and multiple-input multiple-output systems. Also, the results of the far-field show an omnidirectional radiation pattern with an average gain and efficiency of 4 dBi and 93% throughout the frequency band, respectively.

5 citations












Journal ArticleDOI
TL;DR: In this paper , a surface plasmon resonance based on Mach-Zehnder interferometer is produced by combining two normal Single mode fibers with a Photonic Crystal Fiber SMF-PCF-SMF for measuring the refractive index (RI) for ion toxic metal lead.
Abstract: In this study, a surface plasmon resonance based on Mach–Zehnder interferometer is produced by combining two normal Single mode fibers with a Photonic Crystal Fiber SMF-PCF-SMF for measuring the refractive index (RI) for ion toxic metal lead. In the center of the sensor, a small portion (4 cm) of PCF is created, and after the process of tapering is complete, gold is deposited with a thickness of about (40 nm). A photonic crystal fiber's gold-coated core receives a deposit of toxic lead ions. The computed signal to noise ratio (SNR), sensitivity (S), resolution (R), and figures of merit (FOM): SNR is 0.18, Sensitivity is 11.11 m/RIU, Resolution is 1.7 × $${10}^{-4}$$ , and FOM is 22.87.




Journal ArticleDOI
TL;DR: An ultra-wideband band-stop plasmonic filter (UWB-BSF) in mid-infrared (MIR) range based on metal-insulator-metal (MIM) waveguide coupled with a hexagonal resonator is proposed in this article .
Abstract: An ultra-wideband band-stop plasmonic filter (UWB-BSF) in mid-infrared (MIR) range based on metal–insulator–metal (MIM) waveguide coupled with a hexagonal resonator is proposed in this work. Using RSoft CAD commercial software, the designed BSF is numerically and theoretically investigated by the 2D Finite-Difference Time-Domain method. To enhance the BSFs system in mid-infrared, obtaining ultra-wide bandgap width (UWB) with the maximum passband transmission at the left and right of the bandgap and a high value of the rectangular coefficient, we increase the number of hexagonal cavities. Hence, the number of hexagonal resonators controls the range of the filtered wavelength of the BSFs system. In the case of two hexagonal-shaped resonators, the Fano resonance appears on the left and right sides of the bandgap, forming a U-shaped transmission spectrum, which is very helpful for improving the performance of the band-stop filter. Furthermore, by changing the geometric parameters of the hexagonal cavities the filtered wavelength range is shifted toward the near-infrared (NIR) band. The center wavelength of the bandgap of the proposed nano-stop-band filter is adjustable by varying the geometric parameters of the structure. This device operates in the near-infrared (NIR) and mid-infrared (MIR) wavelength ranges. With a larger bandgap width and tunable performance, this proposed nanostructure provides an advantageous application for plasmonic integrated circuits and broadband transmissions.

Journal ArticleDOI
TL;DR: In this article , a review of 55 recent research articles published on fiber Bragg grating sensor for biomedical application used the qualitative, quantitative and experimental method to identify the recent advancement and challenges.
Abstract: Due to attractive application in the medical field, fiber Bragg grating sensor has become increasing attractive from past few decades for various strain sensing applications. FBG sensor has been used in many applications such as different surgical devices, vital sign detection devices, invasive surgery, heart rate, dental applications and biosensing application as wearable sensing devices. This paper reviews the 55 recent research articles published on fiber Bragg grating sensor for biomedical application used the qualitative, quantitative and experimental method to identify the recent advancement and challenges. In this study, particular focus is placed on applications for biomechanical devices, temperature monitors, respiratory monitors, and biosensing applications. Critical things, demands, and emerging trends for these sensing devices are also discussed in order to determine what will be needed for the next generation.