Multiband Generation and Absorption Enhancement in a Graphite-Based Metal-Free Absorber
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Multiband Generation and Absorption Enhancement in a Graphite-Based Metal-Free Absorber Anil Kumar Soni 1 & Gaurav Varshney 2 Received: 6 April 2020 / Accepted: 6 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A technique is implemented for multiband generation and absorption enhancement in a graphite-based absorber. The aspect ratio of the graphite sheet is selected to support the generation of multiple absorption bands. Later on, the notches and slots are inserted in the graphite sheet for absorption enhancement. The generated multiple absorption bands can be controlled separately by varying the different physical parameters of the absorber. The absorber response can be set with the desired frequency ratio, number of bands with desired bandwidth, level of the absorption peaks and frequency selectivity. The resonant frequency of the generated multiple bands can be shifted so that either they can be merged to provide the wide absorption band or the multiband response with sufficient guard bands. The research work represents a way to implement the metal-free absorber structure. Moreover, the proposed structure is polarization insensitive and operates with wide value of the incident angle. In addition, the proposed absorber can also be utilized as a sensor with high sensitivity. Keywords Absorption . Multiband . Metal-free . Enhancement . Graphite . Terahertz
Introduction The study on the terahertz (THz) frequency devices has become popular because of their wide applications in the field of spectroscopy, medical diagnostic, communication and security [1]. THz frequency band lies between the microwave and infrared regions of the electromagnetic spectrum, and this spectrum occupies the frequency band ranging between 0.1 and 10 THz [1, 2]. THz radiation can penetrate up to several millimetre into thin layers of non-metallic substances such as fibres, clothing, plastic and ceramic. Biological tissues contain the sufficient amount of water and due to the non-ionization nature of THz wave it cannot penetrate into the biological tissues [3]. The researchers are studying the THz spectrum and developing devices which can be used in various applications [3–7]. In the recent days, the implementation of different THz devices requires the absorbers with different specifications [8]. The applications like THz imaging [9], spectral * Gaurav Varshney [email protected] 1
ECE Department, School of Studies in Engineering & Technology, Guru Ghasidas Vishwavidyalaya, Bilaspur, Bilaspur 495009, India
2
ECE Department, National Institute of Technology Patna, Patna 800005, Bihar, India
analysis and sensing [10, 11] need the absorbers. Cheon et al. observed a rosonance feature at 1.65 THz associated with various types of cancer diagnosis using the DNA analysis [12, 13]. George et al. found that the THz microfluidic devices can be used in frequency range 0.5 − 2.5 THz for the measurement of the absorbance spectrum of bovine serum albumin [14]. The applications like THz time domain spect
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