R
Raghu Dharmavarapu
Researcher at Indian Institute of Technology Madras
Publications - 16
Citations - 186
Raghu Dharmavarapu is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Resonator & Terahertz radiation. The author has an hindex of 7, co-authored 16 publications receiving 112 citations. Previous affiliations of Raghu Dharmavarapu include Australian National Fabrication Facility & Techno India.
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Generation and decomposition of scalar and vector modes carrying orbital angular momentum: a review
Srinivas Pachava,Raghu Dharmavarapu,Raghu Dharmavarapu,Anand Vijayakumar,Anand Vijayakumar,Sruthy Jayakumar,Amogh Manthalkar,Awakash Dixit,Nirmal K. Viswanathan,Balaji Srinivasan,Shanti Bhattacharya +10 more
TL;DR: In this article, the authors address the needs of scientists and engineers who desire to generate/detect OAM modes and are looking for the technique (active or passive) best suited for their application.
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Diffractive optics for axial intensity shaping of Bessel beams
Raghu Dharmavarapu,Raghu Dharmavarapu,Raghu Dharmavarapu,Shanti Bhattacharya,Saulius Juodkazis,Saulius Juodkazis +5 more
TL;DR: In this paper, the axial intensity of the Bessel beam over centimeter-long propagation distances without expansion of the incoming laser beam is calculated using two diffractive optical elements (DOEs), one converts the input Gaussian intensity profile to an intermediate intensity distribution, which illuminates the second DOE, a binary axicon.
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Dielectric cross-shaped-resonator-based metasurface for vortex beam generation at mid-IR and THz wavelengths
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A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO2) for sensing carbon dioxide gas and humidity
V. Manikandan,Iulian Petrila,S. Vigneselvan,Rajaram S. Mane,Bogdan Stefan Vasile,Raghu Dharmavarapu,Stefan Lundgaard,Saulius Juodkazis,J. Chandrasekaran +8 more
TL;DR: In this article, the authors report the chemiresistive gas and humidity sensing properties of pristine and nickel-doped tin oxide (Ni-SnO2) gas sensors prepared by a microwave-assisted wet chemical method.
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Dielectric cross-shaped resonator based metasurface for vortex beam generation in Mid-IR and THz wavelengths
Raghu Dharmavarapu,Ken-ichi Izumi,Ikufumi Katayama,Soon Hock Ng,Jitraporn Vongsvivut,Mark J. Tobin,AleksandrKuchmizhak,Yoshiaki Nishijima,Shanti Bhattacharya,SauliusJuodkazis +9 more
TL;DR: In this article, a vortex-beam-generating metasurface fabricated specifically for infrared (IR) and terahertz (THz) wavelengths was reported, which consisted of a 2D array of dielectric cross-shaped resonators with spatially varying length.