Browsing by Advisor "Ghosh, Ambarish"
Now showing items 1-20 of 20
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Applications of Magnetic Helical Nanomotors: From Cancer Biology to Dentistry
Micron/nano sized machines promise precise targeting and drug-delivery at hard to reach places inside the human body. There have been tremendous efforts in this direction and various remotely powered artificial nanomachines ... -
Development and application of multi-photon microscopy in neuroscience and nanoscience
Neuroscience is at crossroads. Several interdisciplinary optical developments centred around nonlinear optical processes helps in better understanding of brain function at sub-micron and millisecond precision. Traditional ... -
Dynamics and Organization of Passive and Magnetically Driven Colloids Under Optical Confinement
The physics of confined systems of interacting particles has been a subject of active research for more than a century. Such systems are ubiquitous in nature - examples include petroleum in porous rocks, cytoplasm in ... -
Dynamics, Fluctuations and Rheological Applications of Magnetic Nanopropellers
(2018-01-07)Micron scale robots going inside our body and curing various ailments is a technolog¬ical dream that easily captures our imagination. However, with the advent of novel nanofabrication and nanocharacterization tools there ... -
Engineering Plasmonic Interactions in Three Dimensional Nanostructured Systems
(2018-02-08)Strong light matter interactions in metallic nanoparticles (NPs), especially those made of noble metals such as Gold and Silver is at the heart of much ongoing research in nanoplasmonics. Individual NPs can support collective ... -
Experimental Investigation of Electrons In and Above Liquid Helium
Electrons on the surface of liquid helium form a nearly ideal 2-dimensional electron system (2DES). An electron density up to 2 × 10^9 cm-2, known as the critical electron density, can be achieved on the liquid helium ... -
Experimental Investigation of Multielectron Bubbles in Liquid Helium
(2017-11-28)Multielectron bubbles (MEBs) are micron sized cavities in liquid helium that contain electrons confined within a nanometer thick layer on the inner surface of a bubble. These objects present a rich platform to study the ... -
Exploring Electron Bubbles in Liquid Helium using Cavitation
An electron entering liquid helium experiences a repulsive potential of 1 eV. This originates in the interaction between the injected electron and electrons of the closed shells of helium atoms through Pauli exclusion ... -
From Independent Control to Self Propulsion of Helical Nanoswimmers : Towards All Magnetic Active Matter
There has been a surge of interest in recent years to design and fabricate various types of motile micro/nanoparticles that can be maneuvered using chemical, optical, thermal, electrical or magnetic energy sources. A ... -
Helical Magnetic Nanomotors Fabrication, Toxicity and Therapeutics
The 21st century dawned with remarkable advances in the controlled motion of nanoparticles. These particles could be manipulated through external energy sources (chemical, magnetic, acoustic, or biological), resulting in ... -
Integrating magnetic swimmer with fluorescent color centers
Nitrogen vacancy (NV) centers in diamonds are of current interest as quantum sensors, single photon sources, and biological nano-materials due to their unique optical and spin properties, bio-compatibility, and robust ... -
Integration of Graphene with Plasmonic Nanostructures for Photodetection in the UV, Visible and IR
Graphene is the thinnest material known till date, composed of a two dimensional (2D) arrangement of carbon atoms in a hexagonal lattice. It has interesting mechanical, electrical and optical properties, such as very high ... -
Integration of Resonant Plasmonic Nanostructures with 2D Materials: Strategies and Applications beyond the Visible regime
Plasmonics deals with the interaction of incident electromagnetic waves with the free electron gas within metal nanostructures, enabling rapid signal processing and the confinement of light into subwavelength scales, leading ... -
Investigation of Optical and Electro-optical Effects at Material Interfaces
The key questions addressed in this thesis are related to light-matter interactions at the material interfaces and are related to both plasmonic as well as Pockels effects. Plasmonics enables the design of compact photonic ... -
Magnetically powered helical nanoswimmers
From flocking birds to migrating cells, ‘active matter’ is ubiquitous in the natural world. Almost all known life forms are based on self-propelled entities working collectively to create large-scale structures, networks, ... -
Multielectron Bubbles : A Curved Two-dimensional Electron System in Confinement
(2018-06-15)Electrons are weakly attracted to liquid helium due to the small but finite polarizability of helium atoms. However, they cannot enter the liquid unless their energy is more than 1 eV, due to the Pauli exclusion principle. ... -
Optical and Electrical Studies of Hybrid Nanomaterial Composites Based on Noble Metal Nanostructures
Localized surface plasmon resonance (LSPR) in noble metal nanoparticles like gold (Au) and silver (Ag) results in enhancements in optical absorption and scattering by the nanoparticles, accompanied by a dramatic ... -
Optical and Optothermal route towards dynamic nanomanipulation in fluids
Manipulation of materials with light has led to significant breakthroughs in biology, material science and soft condensed matter physics. Conventional optical tweezer, which is effectively a tightly focused laser beam, can ... -
Studying bubbles in liquid He4 containing single and many electrons
Helium is an inert element with fully occupied orbitals and is a super fluid at low temperatures. An electron close to the surface of liquid Helium faces a long range attraction due to the finite polarizability of the ... -
Theoretical and Experimental Study of Three-Dimensional Chiro-Optical Materials
Light-matter interactions at the nanoscale have been widely studied over the past few decades. In particular, the interaction of light with asymmetric nanostructures has harbored the interests of chemists, biologists and ...