A5051797857- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- 2D Materials and Applications
- Advanced Fiber Optic Sensors
- Carbon and Quantum Dots Applications
- Nanocluster Synthesis and Applications
- MXene and MAX Phase Materials
- Pineapple and bromelain studies
- Perovskite Materials and Applications
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Advanced Photocatalysis Techniques
- Optical Coherence Tomography Applications
- Luminescence and Fluorescent Materials
- Graphene and Nanomaterials Applications
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and interfaces
- Quantum Information and Cryptography
- Molecular Communication and Nanonetworks
Indian Institute of Science Bangalore
2017-2024
Indian Institute of Technology Delhi
1981-2022
Hemwati Nandan Bahuguna Garhwal University
2019
Université de Limoges
2011-2014
Sungkyunkwan University
2013
Centre National de la Recherche Scientifique
2011-2012
Indian Institute of Technology Indore
1982
Abstract Recently, quantum dots (QDs) are finding enormous application in white light emitting diodes (WLEDs) and WLEDs with high color rendition demand. QD-WLEDs use different (Red, Blue, Green) QDs to obtain light. Use of affect purity due self-absorption losses QD degradation, the long run affecting rendering index (CRI) WLEDs. Herein, we report low cost, environment friendly, open air atmosphere synthesis single system carbon (CDs) broad emission bandwidth ranging 116 –143 nm yields (QY)...
Clothing has been produced using textiles for centuries. Their importance and uses in areas such as filtering, protective equipment, medical applications increased over time due to their functional characteristics. The properties of textile fabrics are significantly influenced by the type fiber, manufacturing process used, fabric's underlying structure. Aerogels possess a unique combination properties, including extremely high porosity at nanoscale, low density, excellent thermal insulation...
The Covid-19 pandemic has generated a lot of non-degradable biohazardous plastic waste across the globe in form disposable surgical and N95 masks, gloves, face shields, syringes, bottles storage containers. In present work we address this problem by recycling to single system white light emitting carbon dots (CDs) using pyrolytic method. synthesized CDs have been embedded into transparent polymer dot phosphor. This CD phosphor broad emission bandwidth 205 nm is stable against photo...
We investigated the performance of differential phase shift quantum key distribution using InGaAs/InP and Silicon-APD (avalanche photo diode) for generating secure keys, communication distance, bit error rates under various operating conditions.We compare rate generation as a function length.Our simulation results show that with frequency conversion at telecommunication wavelength silicon-APD contributes in enhanced higher distances than APD optical fiber-based applications.
Abstract The current trends in stimulated Brillouin scattering and optical phase conjugation are overviewed. This report is formed by the selected papers presented “Fifth International Workshop on 2010” Japan. nonlinear properties of based photo-refraction can compensate distortions high power laser systems, they will also open up potentially novel technologies, e.g., stabilization, beam combination, pulse compression, ultrafast shaping, arbitrary waveform generation.
Quantum yield (QY) of carbon dots (CDs) can be enhanced by improving the quality CDs fabricated. Nonradiative transitions, because various factors such as nonemissive surface states, defects, and poor choice ligands, are major deterrents in achieving higher QYs. Such nonradiative transitions curtailed modifying photo-luminescent (PL) centers with a careful control synthesis conditions. Synthesis parameters reaction time, temperature, ligand concentration play role fabricated CDs. In order to...
Carbon dots (CDs), because of their characteristic size (<10 nm) and highly fluorescent nature, can be internalized in biological cells or tagged to the key components a living system. While these attributes potentially exploited for biomedical applications, toxicity CDs remains an important issue addressed. Both synthesis approach morphological critically determine dose-dependent cytocompatibility CDs. Against this perspective, we report herein one-step colloidal using different reaction...
Morphology plays a crucial role in determining the chemical and optical properties of nanomaterials due to confinement effects. We report morphology transition colloidal molybdenum disulfide (MoS2) nanostructures, synthesized by one-pot heat-up method, from mix quantum dots (QDs) nanosheets predominantly nanorods varying synthesis reaction temperature 90 160 °C. The stoichiometry composition QDs, nanosheets, were quantified be MoS2 using energy-dispersive X-ray spectroscopy photoelectron...
Abstract In this article, filamentation of a high power laser beam in hot collisionless plasma is investigated considering the ponderomotive nonlinearity. We have studied effect self focusing (filamentation) on localization ion acoustic wave (IAW) and stimulated Brillouin scattering (SBS) process. The nonlinear coupling between IAW results modification Eigen frequency IAW; consequently, enhanced Landau damping modified mismatch factor SBS process occur. Due to damping, there reduction...
This paper demonstrates the application of a graphene–ferric oxide (hollow mesoporous α-Fe2O3 microspheres) nanocomposite for measurement vacuum pressure. Numerous research and industrial systems essentially require environment, therefore, becomes vital their efficient functioning. The presented graphene pressure sensor (GnVS) is fabricated using reduced (rGO)/α-Fe2O3 synthesized by facile safe hydrothermal process. has an impressive operating range spanning 9 orders magnitude down from...
In this study, we investigate the impact of oleic acid and oleylamine on photoluminescence quantum yield (PLQY) size distribution MoS2 dots (QDs) synthesized by using colloidal heating method. The optical characteristics QDs are found to be dependent OAc/OAm (mL/mL) concentrations, which (0 mL/0 mL), mL/3 (3 mL/6 (6 mL). optimal amount OAc is obtained 3 mL with a high PLQY narrow an average diameter ≈3 nm. A maximum 12.32% measured for mL) blue emission showing PL maxima at ≈440 nm, while...
In this work, we report the synthesis of high-quality, nontoxic InP/ZnS core-shell quantum dots (QDs). The temperature-dependent optical properties such as photoluminescence (PL), absorption, and PL decay with time have been investigated. Based on temperature dependence QDs, three different configurations sensors using PMMA QD host material were fabricated. sensor are planar thin-film (InP/ZnS QD)/PMMA deposited a Si wafer (sensor 1), QD)/PMMA-filled borosilicate fibers 2), QD-doped...
PbS QDs embedded in silicate glass have been prepared and studied for their absorption emission characteristics. The control the understanding of heat-treatment conditions enabled successful fabrication doped optical fibers.
nanocrystalline thin films have been prepared on glass and quartz substrates by chemical bath deposition method, using sodium selenosulfate, which acts both as a source of ions complexing agent, in the bath. Effect pH temperature variation grain size is investigated; it observed that increases with increase temperature. The grow typical rock salt structure lattice parameter shows slight decrease size. Morphology grains to be sensitive their While smaller are spherical, larger nanoparticles...
We report on numerical and experimental results macro bending losses in single-cell Kagome-lattice hollow-core photonic crystal fibers. Fibers with different cladding layer numbers have been investigated. Results show that a at least two rings produces reduction bend sensitivity by more than one order of magnitude relative to single cladding. This result is an original way confirm the main role played inhibiting coupling mechanism such microstructured
For the fabrication of nanoparticle containing optical fibers by melt and draw technique, stability at high temperatures is a requirement. We report synthesis quantum dots as 1000 °C, compatible with fiber drawing, stabilized for first time prior low temperature heating step. It observed that formed this two step leads to better emission powers associated reversible phenomenon, making these nanomaterials suitable further technological applications.
Abstract We report an optimized design of six-ring nodeless antiresonant fiber (NARF) in both single and nested ring configurations the visible wavelength regime. Proposed fibers exhibit a record low loss 6.7 × 10 −4 dB km −1 at 630 nm with less than 1 over broad 330 bandwidth, achieved by incorporation optimization elements primary cladding tubes. A comprehensive analysis, utilizing finite difference algorithm, to study role structural parameters hollow core viz. tube thickness gaps between...
Abstract This communication presents a comparison of two cases to study the process laser beam propagation and Stimulated Brillouin Scattering (SBS) in plasma interaction. These are, with imposing restriction paraxial approximation on and, relaxing this up certain extent. In work, done by Sharma et al. (2009) using is extended taking contribution off-axial rays profile. The spitted profile obtained due uneven focusing its effect localization ion acoustic wave (IAW) has been studied....