Faculty Publications

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Author: search.filters.author.Elizabeth Caroline, E.C.

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    Characterization of a Pentagonal CSRR Bandpass Filter for Terahertz Applications
    (Springer, 2022) Elizabeth Caroline, E.C.; Sagadevan, K.; Danasegaran, S.K.; Kumar, S.
    With the fast magnification of terahertz (THz) technology, it becomes necessary to regulate the terahertz wave transmittance resourcefully. THz filters are crucial for managing devices in THz communication. A metamaterial-based THz bandpass filter (BPF) using a complementary split-ring resonator (CSRR) is proposed with the structure of a square in pentagon (SP). The proposed filter provides high tunability over resonant frequency and bandwidth. The result shows that the resonant frequency of the designed filter is 7 THz, a maximum 3 dB bandwidth of 1.6 THz, return loss of − 28.66 dB, low insertion loss of − 0.001 dB, and the transmittance is almost 100%. The proposed THz filters are used in security screening and biomedical imaging. © 2022, The Minerals, Metals & Materials Society.
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    Photonic crystal fiber sensor for the detection of hazardous gases
    (Springer Science and Business Media Deutschland GmbH, 2022) Nizar, S.M.; Elizabeth Caroline, E.C.; Krishnan, P.
    Three different Photonic Crystal Fiber (PCF) gas sensors are designed to detect five different gases for a wide range of wavelengths. The three unique configurations are designed based on four outer Elliptical cores PCF (4E-PCF), four outer Circular cores (4C-PCF) PCF, and different Eight Elliptical cores PCF (8E-PCF) to analyze and sense the light interface with applied gases. For three proposed gas sensors, the sensing parameters for five different hazardous gases, such as relative sensitivity, effective area, birefringence and dispersion, are acquired. The five different gases considered in the sensor investigation are Sulfur trioxide [SO3] (20 °C), Tetracholorosilane [SiCl4], Tetracholoromethane [CCl4], Turpentine [C10H16], Tin Terra chloride [SnCl4]. Among the three designs, 8E-PCF yields a maximum sensitivity of 75.75%, an effective area of 2.45μm2, and a birefringence of 0.0421 for SnCl4 gas. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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    A Highly Sensitive Photonic Crystal Fiber Gas Sensor for the Detection of Sulfur Dioxide
    (Springer Science and Business Media B.V., 2022) Elizabeth Caroline, E.C.; Nizar, S.M.; Krishnan, P.
    Sulfur dioxide (SO2) is one of the most prevalent contaminants in the atmosphere. It is mostly generated as a byproduct of the burning of sulfur-containing coal and oils, as well as the smelting of various ores. SO2 contributes to the development of major diseases such as asthma and chronic bronchitis. In this paper, we proposed a Wheel Structured circular air hole Photonic Crystal Fiber (WS-PCF) based gas sensor to detect SO2 gas. The proposed WS-PCF gas sensor consists of a four-layer-thick circular cladding air hole. The diameter of the first layer varies throughout the optimization procedure, while the diameters of the succeeding three layers remain constant. The numerical investigation on the sensor parameters such as numerical aperture, effective area, non-linearity, confinement, loss and the relative sensitivity of the proposed sensor are extensively analyzed in a wavelength range of 0.9 µm to 1.2 µm. The proposed WS-PCF gas sensor offers the highest relative sensitivity of 83.64% and a lower confinement loss of 6.34 × 10 - 9dB/ km. The proposed sensor is simple and offers 14% high sensitivity and very low confinement loss (10-3reportedinliterature) compared with the exist literature. © 2022, The Author(s), under exclusive licence to Springer Nature B.V.