Vuppu Vinay Pradeep

ORCID: 0000-0001-6463-9370
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About
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Research Areas
  • Mechanical and Optical Resonators
  • Photonic and Optical Devices
  • Force Microscopy Techniques and Applications
  • X-ray Diffraction in Crystallography
  • Crystallization and Solubility Studies
  • Luminescence and Fluorescent Materials
  • Molecular Junctions and Nanostructures
  • Nanofabrication and Lithography Techniques
  • Advanced Materials and Mechanics
  • Advanced Fluorescence Microscopy Techniques
  • Nonlinear Optical Materials Studies
  • Crystallography and molecular interactions
  • Semiconductor Quantum Structures and Devices
  • Molecular Sensors and Ion Detection
  • ZnO doping and properties
  • Integrated Circuits and Semiconductor Failure Analysis
  • Microfluidic and Capillary Electrophoresis Applications
  • Advanced MEMS and NEMS Technologies
  • Energy Harvesting in Wireless Networks
  • Semiconductor materials and devices
  • Strong Light-Matter Interactions
  • Neural Networks and Reservoir Computing
  • Antenna Design and Analysis
  • Acoustic Wave Resonator Technologies
  • Photochromic and Fluorescence Chemistry

University of Hyderabad
2019-2024

General Electric (India)
2024

M. Kumarasamy College of Engineering
2023

Rao Research and Consulting (United States)
2020

Birla Institute of Technology, Mesra
1993

Abstract We present the one‐dimensional optical‐waveguiding crystal dithieno[3,2‐a:2′,3′‐c]phenazine with a high aspect ratio, mechanical flexibility, and selective self‐absorbance of blue part its fluorescence (FL). While macrocrystals exhibit elasticity, microcrystals deposited at glass surface behave more like plastic crystals due to significant adherence, making them suitable for constructing photonic circuits via micromechanical operation an atomic‐force‐microscopy cantilever tip. The...

10.1002/anie.202003820 article EN Angewandte Chemie International Edition 2020-05-11

Abstract This study introduces mechanically induced phenomena such as standing, leaning, stacking, and interlocking behaviors in naturally twisted optical waveguiding microcrystals on a substrate. The microscale crystal self-assembled from 2,4-dibromo-6-(((2-bromo-5-fluorophenyl)imino)methyl)phenol is flexible emits orange fluorescence. Mechanistic analysis reveals the strain generated by intergrowing orientationally mismatched nanocrystallites responsible for growth. crystal’s mechanical...

10.1038/s41467-024-47924-y article EN cc-by Nature Communications 2024-05-13

Abstract Precise mechanical processing of optical microcrystals involves complex microscale operations viz. moving, bending, lifting, and cutting crystals. Some these can be implemented by applying force at specific points the crystal to fabricate advanced crystalline junctions. Mechanically compliant flexible crystals are ideal candidates for designing such microoptical A vapor‐phase growth naturally bent waveguiding 1,4‐bis(2‐cyanophenylethynyl)benzene ( 1 ) on a surface forming different...

10.1002/smll.202006795 article EN Small 2020-12-23

We demonstrate mechanically-powered rolling locomotion of a twisted-microcrystal optical-waveguide cavity on the substrate, rotating output signal's linear-polarization. Self-assembly (E)-2-bromo-6-(((4-methoxyphenyl)imino)methyl)-4-nitrophenol produces naturally twisted microcrystals. The strain between several intergrowing, orientationally mismatched nanocrystalline fibres dictates pitch lengths crystals. crystals are flexible, perpendicular to (001) and (010) planes due π⋅⋅⋅π stacking,...

10.1002/anie.202202114 article EN Angewandte Chemie International Edition 2022-03-12

Abstract The progress of photonic integrated circuits (PICs) and related nanophotonic technologies is greatly influenced by precise complex circuit fabrication know‐how. integration chemically different, multiple optical components for constructing hybrid PICs a tedious costly affair. Herein, novel approach to construct key component reported, namely organic add‐drop filter (HOADF) tandem use two different techniques, namely, mechanophotonics (micromechanical manipulation) crystal photonics...

10.1002/lpor.202300552 article EN Laser & Photonics Review 2023-09-14

Abstract We present the one‐dimensional optical‐waveguiding crystal dithieno[3,2‐a:2′,3′‐c]phenazine with a high aspect ratio, mechanical flexibility, and selective self‐absorbance of blue part its fluorescence (FL). While macrocrystals exhibit elasticity, microcrystals deposited at glass surface behave more like plastic crystals due to significant adherence, making them suitable for constructing photonic circuits via micromechanical operation an atomic‐force‐microscopy cantilever tip. The...

10.1002/ange.202003820 article EN Angewandte Chemie 2020-05-11

Fabrication of organic photonic integrated circuits (OPICs) greatly relies on crystalline materials with high mechanical flexibility and fluorescence (FL). Realizing an efficient OPIC multiple functions suitable for practical applications depends creating complex circuit architectures. The optical crystals are susceptible to subtle differences in the molecular packing and, more importantly, type intermolecular interactions. Herein, crystal ( E...

10.1002/sstr.202100163 article EN Small Structures 2021-11-25

Abstract Highly pure, organic, crystalline materials with nonlinear optical (NLO) properties are in great demand due to their potential be utilized miniaturized nanophotonic device applications. Perylene dye is one of the celebrated near‐direct bandgap NLO materials. It crystallizes two distinctive polymorphic forms (square‐shaped, α, and rhombus‐shaped, β) emitting yellow green fluorescence, respectively. However, selective access any microcrystals possessing qualities such as...

10.1002/adom.201901317 article EN Advanced Optical Materials 2019-11-21

Organic micro-heterostructures (MHS) with dual optical emissions are essential to produce miniaturized waveguides for wavelength division multiplexing technologies. The bimolecular MHS produced by solution-based bottom-up self-assembly technique often leads poor surface smoothness, edge imperfection, defects, and unwanted thin films deposits. Conversely, sequential sublimation at ambient pressure facilitates effective integration of α-perylene micro-square...

10.1002/asia.201901221 article EN Chemistry - An Asian Journal 2019-09-18

Flexible organic crystals (elastic and plastic) are important materials for optical waveguides, tunable optoelectronic devices, photonic integrated circuits. Here, we present highly elastic of a Schiff base, 1-((E)-(2,5-dichlorophenylimino)methyl)naphthalen-2-ol (1), an azine molecule, 2,4-dibromo-6-((E)-((E)-(2,6-dichlorobenzylidene)hydrazono)methyl)phenol (2). These microcrystals flexible under external mechanical force, both in the macroscopic microscopic regimes. The flexibility these...

10.1002/chem.202200905 article EN Chemistry - A European Journal 2022-05-06

Abstract Highly reproducible manufacturing of organic optical crystals with well‐defined geometry and dimension is important to realize industrially relevant all‐organic microelectronic nanophotonic components photonic integrated circuits. Here, programmed shape size alteration square‐shaped perylene crystal resonators into circular disk rectangular geometries demonstrated using the focused‐ion‐beam milling technique. The fabricated smaller sized display shape‐ size‐dependent modes. Due...

10.1002/adom.202201150 article EN Advanced Optical Materials 2022-08-26

The advancements in organic photonics have reached new heights the recent past with demonstration of diverse crystal optical components and circuits. However, development industrially viable manufacturing is need hour for finding an alternative to silicon-based photonics. Here, we demonstrate focused ion beam (FIB) milling as a tool shape single crystals into cavities geometries dimensions. generality FIB was tested on perylene coumarin-153 microcrystals. microcrystals obtained by...

10.1039/d3nr02229c article EN Nanoscale 2023-01-01

Abstract We demonstrate mechanically‐powered rolling locomotion of a twisted‐microcrystal optical‐waveguide cavity on the substrate, rotating output signal's linear‐polarization. Self‐assembly ( E )‐2‐bromo‐6‐(((4‐methoxyphenyl)imino)methyl)‐4‐nitrophenol produces naturally twisted microcrystals. The strain between several intergrowing, orientationally mismatched nanocrystalline fibres dictates pitch lengths crystals. crystals are flexible, perpendicular to (001) and (010) planes due π⋅⋅⋅π...

10.1002/ange.202202114 article EN Angewandte Chemie 2022-03-12

The rapid development of organic photonic devices is possible with an industrially viable focused ion beam (FIB) milling technique. In this aspect, understanding and unveiling the optimized FIB parameters to attain nano-/microscale shape size precision molecular crystals are essential achieve all-organic modules. Herein, we demonstrate on perylene single self-assembled conductive (indium tin oxide coated polyethylene terephthalate: ITO-PET) nonconductive (borosilicate glass coverslip)...

10.1021/acs.cgd.3c00653 article EN Crystal Growth & Design 2023-07-11

Observation of light-triggered anomalous effects on a growing crystal is important from both fundamental and technological perspectives. Our experiments focus the aggregation model photoisomerizable molecule, namely, (Z)-3-(3′,5′-bis(trifluoromethyl)-[1,1′-biphenyl]-4-yl)-2-(4-bromophenyl) acrylonitrile (1), under tight-focused laser light. Phenomenally, by shining light specific wavelength at facet–solution interface, growth can be precisely paused, resumed, reversed. By focusing just half...

10.1021/acs.jpcc.1c00709 article EN The Journal of Physical Chemistry C 2021-02-23

Ambient pressure chemical vapour deposition of 5,5'-bis((2-(trifluoromethyl)phenyl)ethynyl)-2,2'-bithiophene provides ultrapure needle-shaped crystals. The crystal's supramolecular structure consists an array hydrogen bonds and π-π interactions leading to anisotropic arrangements. cyan emitting crystals exhibit optical waveguiding tendency with guided polarised emissions due molecular

10.1002/asia.202100910 article EN Chemistry - An Asian Journal 2021-09-01

This study introduces mechanically induced novel phenomena such as standing, leaning, stacking, and interlocking behaviors in naturally twisted optical waveguiding microcrystals on a substrate. The crystal self-assembled from 2,4-dibromo-6-(((2-bromo-5-fluorophenyl)imino)methyl)phenol is flexible emits orange fluorescence. Crystal’s mechanical flexibility the perpendicular direction to (001) (010) planes can be attributed intermolecular interactions, including C-H···Br, N-H···O, C-H···O,...

10.26434/chemrxiv-2023-7n8kp preprint EN cc-by-nc-nd 2023-11-16

The effect of optical illumination on the microwave characteristics a conventional HEMT has been studied theoretically. paper describes an integral approach to problem which includes calculation capacitance and sheet concentration 2-D electron gas in illuminated condition. Y-parameters device under direct control at frequencies have calculated by considering changes various intrinsic parameters lumped circuit model condition obtained with components determined from Y-parameters. attractive...

10.1080/03772063.1993.11437147 article EN IETE Journal of Research 1993-11-01

Time-dependent monitoring of aggregation-induced fluorescence a model compound namely, (Z)-3-(3',5'-bis(trifluoromethyl)-[1,1'-biphenyl]-4-yl)-2-(4-bromophenyl)acrylonitrile unearth hitherto unknown molecular level events such as onset aggregation, their growth, size, and diffusion dynamics. The presented generalized approach can also be extended to in situ controlling various biological aggregation processes down single-cell all aspects materials chemistry, well.

10.1039/d0sm00108b article EN Soft Matter 2020-01-01

Highly reproducible manufacturing of organic optical crystals with well-defined geometry and dimension is important to realize industrially relevant all-organic microelectronic nanophotonic components, photonic integrated circuits. Here, we demonstrate programmed shape size alteration perylene crystal resonators into disk rectangular geometries using focused-ion beam milling technique. Due highly nature the employed technique, fabricated smaller sized displaying dependent modes are suitable...

10.48550/arxiv.2203.14218 preprint EN cc-by-nc-nd arXiv (Cornell University) 2022-01-01

Abstract In this work, the proposed design utilizes a complementary split ring resonator (CSRR) loaded ground plane to enhance return loss of microstrip patch antenna.The addition CSRR slots on resulted in an improvement antenna. The antenna has undergone stages design, fabrication, and testing. measured results exhibit high level conformity with simulation results. size 99 × 55 1.6mm 3. impedance 1 Springer Nature 2021 L A T E X template Compact Metamaterial Loaded MIMO Antenna for Sub-6GHz...

10.21203/rs.3.rs-3268912/v1 preprint EN cc-by Research Square (Research Square) 2023-08-25
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