Prof. Venu Gopal Achanta Profile

Prof. Venu Gopal Achanta

at Tata Institute of Fundamental Research

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Publications (8)

Proceedings Article | 13 March 2024 Poster

Emission engineering via the silicon nitride photonic platform

Kishor Kumar Mandal, Anuj Kumar Singh, Anshuman Kumar, Brijesh Kumar, Venu Gopal Achanta

Proceedings Volume PC12889, PC1288917 (2024) https://doi.org/10.1117/12.3003155

KEYWORDS: Silicon nitride, Microresonators, Microrings, Waveguides, Photonic integrated circuits, Transition metals, Resonators, Fabrication, Visible radiation, Reactive ion etching

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Proceedings Article | 31 May 2023 Presentation + Paper

Application of plasmonic quasi crystal (PIQC) in surface enhanced Raman spectroscopy (SERS)

Richa Goel, Rishabh Vij, Sibashish Chakraborty, Venu Gopal Achanta, Satish Kumar Dubey

Proceedings Volume 12572, 125720J (2023) https://doi.org/10.1117/12.2665291

KEYWORDS: Surface enhanced Raman spectroscopy, Raman spectroscopy, Plasmonics, Urea, Plasma generation, Gold, Electron beam lithography, Reproducibility, Nanostructures, Nanolithography

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Proceedings Article | 10 September 2019 Presentation

Control of magnetization dynamics by spin-Nernst torque (Conference Presentation)

Arnab Bose, Ambika Shukla, Sutapa Dutta, Swapnil Bhuktare, Hanuman Singh, Venu Achanta, Ashwin Tulapurkar

Proceedings Volume 11090, 110900V (2019) https://doi.org/10.1117/12.2529941

KEYWORDS: Nickel, Platinum, Ferromagnetics, Fermium, Frequency modulation, Applied physics

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Proceedings Article | 3 September 2019 Paper

Setup of a confocal nanoscope in reflection using a super-oscillatory lens

Arvind Nagarajan, Marijn Siemons, L. Stoevelaar, Fabrizio Silvestri, Venu Gopal Achanta, Stefan M. Bäumer, Giampiero Gerini

Proceedings Volume 11089, 110892E (2019) https://doi.org/10.1117/12.2528717

KEYWORDS: Confocal microscopy, Polarization, Relays, Optical alignment, Alignment procedures, Point spread functions

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Proceedings Article | 14 May 2018 Presentation + Paper

Quadrupolar interactions to achieve high Q plasmon induced transparency

Goutam Rana, Prathmesh Deshmukh, S. Duttagupta, S. Prabhu, Venu Gopal Achanta, G. Agarwal

Proceedings Volume 10657, 106570Z (2018) https://doi.org/10.1117/12.2304508

KEYWORDS: Terahertz radiation, Transparency, Plasmons, Metamaterials, Plasmonics, Gold, Structural design, Metals, Absorption, Antennas

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Proceedings Article | 4 May 2018 Paper

Quantitative polarimetric studies of Plasmonic quasicrystals

S. Chandel, Ajith R., A. K. Singh, Aneeth A., A. Venugopal, N. Ghosh

Proceedings Volume 10672, 106722P (2018) https://doi.org/10.1117/12.2306496

KEYWORDS: Polarization, Plasmonics, Crystals, Anisotropy, Scattering, Dielectric polarization, Polarimetry, Metals, Gold

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Plasmonic quasicrystals stand out as the center of cynosure behind the many potential applications which emerges due to the quasi-periodic structure and metal dielectric patterns. The rotational symmetry elicits the optical properties resembling like crystals and and the metal dielectric nanostructure are being probed and explored in various disciplines of science and even in engineering also. Plasmonic quasicrystals composed of quasi- periodic and metal-dielectric patterns furnish efficacious benefits in improving the efficiency of solar cells, broadband transmission enhancement, and bio-sensing applications etc. Due to the intriguing properties of plasmonic crystals such as periodicity and short range ordering, the excitation of the surface Plasmon polaritons is restricted by a few fewer techniques such as polarization, launch angle dependence. Polarization contains wealth of information and holds the potential to control the interaction of light with metal Nano particles. Therefore, an exhaustive and thorough information regarding incident and scattered light is necessary for the examining the spectral response of the quasi crystal. Here, we report to the best of our knowledge the first ever quantitative polarimetric studies on the extremely complex plasmonic quasicrystal by recording a full 4x4 spectral Mueller matrix from the same and tried to explore the fascinating and interesting properties of quasi crystals. A homebuilt comprehensive Mueller Matrix platform (integrated with dark field microscope) is utilized to record the conventionally weak, intermixed polarization signal from plasmonic quasicrystals. These studies probed the enthralling phenomena of Fano resonance, explored and probed the presence of phase anisotropy in the plasmonic quasicrystals using the Mueller matrix derived retardance (δ) parameter. Additionally polarization mediated tuning of Fano Resonance is achieved too. Moreover it is demonstrated that the Mueller matrix derived diattenuation, retardance parameters probes the Fano resonance, phase and amplitude anisotropy from such complex plasmonic nanostructure and proved instrumental in polarization controlled tuning of Fano resonance.

Proceedings Article | 30 May 2003 Paper

Realization of ultrafast and low-power all-optical switches using intersubband transitions in a novel InGaAs/AlAs/AlAsSb quantum well structure

Teruo Mozume, Jun-ichi Kasai, Nikolai Georgiev, Takasi Simoyama, Achanta Gopal, Haruhiko Yoshida

Proceedings Volume 4992, (2003) https://doi.org/10.1117/12.475706

KEYWORDS: Quantum wells, Absorption, Scattering, Interfaces, Indium gallium arsenide, Antimony, Picosecond phenomena, Gallium, Switching, Statistical analysis

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Proceedings Article | 14 May 2002 Paper

Large intersubband nonlinearity for all-optical switching at 1.72 micron in Sb-based quantum wells

A. Gopal, Haruhiko Yoshida, Arup Neogi, Teruo Mozume, Nikolai Georgiev, Takasi Simoyama, Osamu Wada, Hiroshi Ishikawa

Proceedings Volume 4638, (2002) https://doi.org/10.1117/12.467468

KEYWORDS: Absorption, Quantum wells, Switching, Switches, Shape analysis, Nonlinear optics, Semiconductors, Excitons, Solids, Continuous wave operation

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Showing 5 of 8 publications

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