Prabhat Verma
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Plasmon Nanofocusing for Tip‐Enhanced Raman Spectroscopy: Principles, Strategies, and Applications Open
Plasmon nanofocusing has emerged as a powerful optical technique for achieving extreme confinement of electromagnetic fields at the nanometer scale by adiabatically compressing propagating surface plasmon polaritons along tapered metallic …
Tip-scan high-speed atomic force microscopy in organic solvent: A versatile tool for visualizing dynamic behaviors of soft-materials Open
High-speed atomic force microscopy (HS-AFM) is a powerful tool for video recording nanoscale dynamics of samples. Its applications have recently expanded to various fields from biology to chemistry, including supramolecular chemistry and p…
View article: Comparison of near-field light intensities: plasmon nanofocusing versus localized plasmon resonance
Comparison of near-field light intensities: plasmon nanofocusing versus localized plasmon resonance Open
The localized surface plasmon resonance of metallic nanostructures produces strongly localized and enhanced near-field light, significantly contributing to nanophotonics research and applications. Plasmon nanofocusing represents another me…
View article: Imaging vs Nonimaging Raman Spectroscopy for High-Throughput Single-Cell Phenotyping
Imaging vs Nonimaging Raman Spectroscopy for High-Throughput Single-Cell Phenotyping Open
Raman spectroscopy can provide nonbiased single-cell analysis based on the endogenous ensemble of biomolecules, with alterations in cellular content indicative of cell state and disease. The measurements themselves can be performed in a va…
In-situ real-time observation of photo-induced nanoscale azo-polymer motions using high-speed atomic force microscopy combined with an inverted optical microscope Open
High-speed atomic force microscopy (HS-AFM) is an indispensable technique in the biological field owing to its excellent imaging capability for the real-time observation of biomolecules with high spatial resolution. Furthermore, recent dev…
Numerical characterization of optical properties of tapered plasmonic structure on a cantilever pyramidal tip for plasmon nanofocusing Open
The plasmon nanofocusing process has been widely implemented in near-field scanning optical microscopy (NSOM) recently because it allows generating a background-free nanolight source at the apex of a metallic tip, enabling high contrast im…
Nanoscale optical switching of photochromic material by ultraviolet and visible plasmon nanofocusing Open
Optical control of electronic properties is essential for future electric devices. Manipulating such properties has been limited to the microscale in spatial volume due to the wave nature of light; however, scaling down the volume is in ex…
Ultrastable tip-enhanced hyperspectral optical nanoimaging for defect analysis of large-sized WS <sub>2</sub> layers Open
Optical nanoimaging techniques, such as tip-enhanced Raman spectroscopy (TERS), are nowadays indispensable for chemical and optical characterization in the entire field of nanotechnology and have been extensively used for various applicati…
Tip-enhanced Raman spectroscopy with amplitude-controlled tapping-mode AFM Open
Tip-enhanced Raman spectroscopy (TERS) is a powerful tool for analyzing chemical compositions at the nanoscale owing to near-field light localized at a metallic tip. In TERS, atomic force microscopy (AFM) is commonly used for tip position …
The processing and health benefits of herbal tea Open
Herbal tea is a popular beverage/drink that is made from a variety of plant parts. Herbal teas are drunk by people from many walks of life for a variety of reasons, including disease prevention, taste, and pleasure. Herbs, in addition to t…
Microwave-assisted extraction and quality evaluation of pectin from sweet lemon peel Open
Pectin, a natural polysaccharide, is commercially extracted from citrus peels and several other sources such as bananas, apples and grapes, etc. under acidic conditions. Pectin is used in beverages, confectionery and many fruit drinks. It …
View article: SiPM Based Imaging Camera for 4m Class Telescope
SiPM Based Imaging Camera for 4m Class Telescope Open
In last few years, SiPMs have emerged as a viable alternative to PMTs used in the imaging atmospheric Cherenkov telescopes. In addition to their higher photon detection efficiency, SiPMs provide attractive features like possible increase i…
Polarization Raman Imaging of Organic Monolayer Islands for Crystal Orientation Analysis Open
An organic semiconductor film made of diphenyl derivative dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DPh-DNTT) has high carrier mobility. However, this mobility may be greatly affected by the crystal orientation of the DPh-DNTT's firs…
Tip-Enhanced Raman Spectroscopy Open
Visible light can interact efficiently with the vibronic and electronic systems of a sample and fetch rich information about the intrinsic features, such as the chemical, physical and biological properties of the sample. Optical techniques…
White nanolight source for optical nanoimaging Open
We created a nanoscale white light source, which realized a unique optical imaging and showed great potential for nanoscicence.
Orientation analysis of pentacene molecules in organic field-effect transistor devices using polarization-dependent Raman spectroscopy Open
Pentacene, an organic molecule, is a promising material for high-performance field effect transistors due to its high charge carrier mobility in comparison to usual semiconductors. However, the charge carrier mobility is strongly dependent…
Raman and Ellipsometric Investigation of 570 nm CdTe thin film layer deposited by RF-Sputtering system Open
In this work, we characterized the 570 nm CdTe layer deposited on a glass substrate by RF-Magnetron sputtering technique at the substrate temperature of 200 o C. Four experimental techniques were used in this study to characterize the thin…
Tapered arrangement of metallic nanorod chains for magnified plasmonic nanoimaging Open
Plasmonic nanolens, a 3-dimensional tapered arrangement of metallic nanorod chains, holds a great promise as a new plasmonics-based optical nano-imaging technique. While multiple nanorod chains can transfer the near-field signal originatin…
Raman Spectroscopic Studies of Dinaphthothienothiophene (DNTT) Open
The application of dinaphthothienothiophene (DNTT) molecules, a novel organic semiconductor material, has recently increased due to its high charge carrier mobility and thermal stability. Since the structural properties of DNTT molecules, …
Security and Privacy in E-Healthcare Monitoring with WBAN: A Critical Review Open
In the current scenario Wireless Body Area network (WBAN) has made its prominent place among technological advancements to improve human health.Since WBAN uses a wireless technique for communication, it has various positive & striking feat…
International research collaboration activities in Photonics Center of Osaka University Open
Photonics Center at Osaka University has been a world-class center for research, education and industrial collaboration in the field of photonics for the past 10 years. Particularly, for the past 5 years, Photonics Center had a JSPS-funded…