Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Basudev Roy"'
Publikováno v:
Advanced Photonics Research, Vol 5, Iss 6, Pp n/a-n/a (2024)
Conventionally, a collimated visible laser beam can only be focused to a transverse region volume with a waist of about 200 nm and an axial waist of about 1200 nm due to the wave nature of light. Several techniques have been used to bypass the diffra
Externí odkaz:
https://doaj.org/article/cd7077a738de4503adcb69274e9962d8
Autor:
Kingshuk Panja, Jayesh Goswami, Gokul Nalupurackal, Snigdhadev Chakraborty, Srestha Roy, Basudev Roy, Rajesh Singh
Publikováno v:
Results in Physics, Vol 61, Iss , Pp 107709- (2024)
Controlling the translational and rotational motion of microparticles is a topic of current interest in soft matter and statistical mechanics. Roll rotation of a microparticle in a hydro-thermophoretic trap – which is a device that uses the flow of
Externí odkaz:
https://doaj.org/article/c7efb83eca0440fdbba9cc74653fde57
Autor:
Srestha Roy, Atanu Ghosh, Muruga Lokesh, Gokul Nalupurackal, Snigdhadev Chakraborty, Jayesh Goswami, Vidya P Bhallamudi, Siddharth Dhomkar, Basudev Roy
Publikováno v:
Journal of Physics Communications, Vol 8, Iss 5, p 055001 (2024)
In this article, we explore the effect of two different infrared (IR) laser wavelengths on the optical properties of trapped nano-diamonds containing high-density ensembles of nitrogen vacancy (NV) centers. We investigate 975 nm and 1064nm wavelength
Externí odkaz:
https://doaj.org/article/bafdfdf5354543a7845335433d0a53b7
Autor:
Srestha Roy, Rahul Vaippully, Muruga Lokesh, Gokul Nalupurackal, Privita Edwina, Saumendra Bajpai, Basudev Roy
Publikováno v:
Frontiers in Physics, Vol 10 (2023)
A colloidal particle placed inside the cell cytoplasm is enmeshed within a network of cytoskeletal fibres immersed in the cytosolic fluid. The translational mode is believed to yield different rheological parameters than the rotational mode, given th
Externí odkaz:
https://doaj.org/article/cabea8faa3f34ecba4bb505d9d18e420
Autor:
Gokul Nalupurackal, Kingshuk Panja, Snigdhadev Chakraborty, Srestha Roy, Jayesh Goswami, Basudev Roy, Rajesh Singh
Publikováno v:
Physical Review Research, Vol 5, Iss 3, p 033005 (2023)
In recent years, there has been a growing interest in controlling the motion of microparticles inside and outside a focused laser beam. A hydro-thermophoretic trap was recently reported [Nalupurackal et al., Soft Matter 18, 6825 (2022)1744-683X10.103
Externí odkaz:
https://doaj.org/article/3086e91911344673b98aa7705f4499b2
Autor:
Snigdhadev Chakraborty, Gokul Nalupurackal, M Gunaseelan, Srestha Roy, Muruga Lokesh, Jayesh Goswami, Priyankan Datta, Pallab Sinha Mahapatra, Basudev Roy
Publikováno v:
Journal of Physics Communications, Vol 7, Iss 6, p 065008 (2023)
Upconverting particles like Yb and Er-doped NaYF _4 are known to heat up after illumination with light at pump wavelength due to inefficient upconversion processes. Here we show that NaYF _4 particles which have been co-doped not only with Yb and Er
Externí odkaz:
https://doaj.org/article/15a7f736073744c19568de00428de332
Autor:
Gokul Nalupurackal, Muruga Lokesh, Sarangi Suresh, Srestha Roy, Snigdhadev Chakraborty, Jayesh Goswami, Gunaseelan M, Arnab Pal, Basudev Roy
Publikováno v:
New Journal of Physics, Vol 25, Iss 6, p 063001 (2023)
The realization of microscopic heat engines has gained a surge of research interest in statistical physics, soft matter, and biological physics. A typical microscopic heat engine employs a colloidal particle trapped in a confining potential, which is
Externí odkaz:
https://doaj.org/article/a508a81f96984bb48085365ec6520ab7
Autor:
Giovanni Volpe, Onofrio M Maragò, Halina Rubinsztein-Dunlop, Giuseppe Pesce, Alexander B Stilgoe, Giorgio Volpe, Georgiy Tkachenko, Viet Giang Truong, Síle Nic Chormaic, Fatemeh Kalantarifard, Parviz Elahi, Mikael Käll, Agnese Callegari, Manuel I Marqués, Antonio A R Neves, Wendel L Moreira, Adriana Fontes, Carlos L Cesar, Rosalba Saija, Abir Saidi, Paul Beck, Jörg S Eismann, Peter Banzer, Thales F D Fernandes, Francesco Pedaci, Warwick P Bowen, Rahul Vaippully, Muruga Lokesh, Basudev Roy, Gregor Thalhammer-Thurner, Monika Ritsch-Marte, Laura Pérez García, Alejandro V Arzola, Isaac Pérez Castillo, Aykut Argun, Till M Muenker, Bart E Vos, Timo Betz, Ilaria Cristiani, Paolo Minzioni, Peter J Reece, Fan Wang, David McGloin, Justus C Ndukaife, Romain Quidant, Reece P Roberts, Cyril Laplane, Thomas Volz, Reuven Gordon, Dag Hanstorp, Javier Tello Marmolejo, Graham D Bruce, Kishan Dholakia, Tongcang Li, Oto Brzobohatý, Stephen H Simpson, Pavel Zemánek, Felix Ritort, Yael Roichman, Valeriia Bobkova, Raphael Wittkowski, Cornelia Denz, G V Pavan Kumar, Antonino Foti, Maria Grazia Donato, Pietro G Gucciardi, Lucia Gardini, Giulio Bianchi, Anatolii V Kashchuk, Marco Capitanio, Lynn Paterson, Philip H Jones, Kirstine Berg-Sørensen, Younes F Barooji, Lene B Oddershede, Pegah Pouladian, Daryl Preece, Caroline Beck Adiels, Anna Chiara De Luca, Alessandro Magazzù, David Bronte Ciriza, Maria Antonia Iatì, Grover A Swartzlander Jr
Publikováno v:
JPhys Photonics, Vol 5, Iss 2, p 022501 (2023)
Optical tweezers are tools made of light that enable contactless pushing, trapping, and manipulation of objects, ranging from atoms to space light sails. Since the pioneering work by Arthur Ashkin in the 1970s, optical tweezers have evolved into soph
Externí odkaz:
https://doaj.org/article/35158dcdeb7b4194b3504e0cb0ba3aa7
Autor:
Sumeet Kumar, Amrendra Kumar, M. Gunaseelan, Rahul Vaippully, Dipanjan Chakraborty, Jayaraman Senthilselvan, Basudev Roy
Publikováno v:
Frontiers in Physics, Vol 8 (2020)
Upconverting nanoparticles typically absorb low frequency radiation and emit at higher frequencies relying upon multiphoton processes. One such type of particle is NaYF4:Yb,Er, which absorbs at 975 nm while emitting in visible radiation. Such particl
Externí odkaz:
https://doaj.org/article/01452790f802468090a5a443fb91d95b
Publikováno v:
New Journal of Physics, Vol 16, Iss 8, p 083037 (2014)
The spin orbit interaction (SOI) of light has been the focus of recent research due to the fundamental consequences and potential applications in diverse systems, ranging from inhomogeneous anisotropic media to engineered plasmonics and metamaterial
Externí odkaz:
https://doaj.org/article/a3eeca9506fc493abeb8a2c440458e30