An International Peer Reviewed Research Journal

AJP Vol 30 No 2, 2021

AJP

SSN : 0971 - 3093

Vol 30, No 2, February, 2021


Asian


Journal of Physics

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Volume 30                                                               No 2                                                              February 2021

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Anita Publications
FF-43, 1st Floor, Mangal Bazar, Laxmi Nagar, Delhi-110 092, India

Asian Journal of Physics                                                                                                       Vol. 30 No 2, 2021, 219-238


Wolfgang Kiefer – Multi-Talented German Physicist

Rajinder Singh
Research Group: Physics Education and History of Science.
Physics Department, Institute of Physics. University of Oldenburg. 26111 Oldenburg, Germany
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I have written more than 30 books and a number of articles on scientists and politicians. However, I have no experience of writing on a living legend, like Prof Wolfgang Kiefer. Professor Vinod Rastogi, Editor-in-Chief, Asian Journal of Physics, told me that he is planning to organize a special issue of AJP honouring him on the occasion of his 80th birthday on Feb 12, 2021, and invited me to contribute something. I happily agreed, as I know Professor Kiefer for a while, though, only through correspondence, and never had the opportunity to meet him personally.

Wolfgang Kiefer – Multi-Talented German Physicist.pdf
Rajinder Singh

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Asian Journal of Physics                                                                                                           Vol. 30 No 2, 2021, 281-301


Immuno-SERS microscopy: From SERS nanotag design and correlative single-particle 

spectroscopy to protein localization on single cells and tissue


Michelle Hechler, Supriya Srivastav and Sebastian Schlücker*
Department of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE),
University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany

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This review summarizes work from the authors’ laboratory on immuno-surface-enhanced Raman scattering (iSERS) microscopy since the demonstration of its proof of concept in 2006. iSERS microscopy is an emerging bioimaging technique for the selective localization of proteins on single cells and tissue. Selectivity for target proteins is achieved by labeling the corresponding antibodies with SERS labels/nanotags, i.e., molecularly functionalized noble metal nanoparticles for spectral identification. Central advantages of iSERS are multiplexing, quantification, minimization of autofluorescence, no/minimal photobleaching and the need for only a single laser excitation wavelength. The performance of SERS labels/nanotags can be studied in correlative single-particle SERS microspectroscopic and electron microscopic experiments. The rational design of optimal SERS labels/nanotags can be supported by computer simulations predicting the optical properties including the SERS signal enhancement. Work on iSERS from the authors’ group over the past 15 years on the selective localization of target proteins, especially in cancer diagnostics, on tissue and single cells is highlighted. © Anita Publications. All rights reserved.

Keywords: iSERS microscopy, SERS labels/nanotags, (iSECARS), Bioimaging technique.

Total Refs : 60

Immuno-SERS microscopy: From SERS nanotag design and correlative single- particle spectroscopy to protein localization on single cells and tissue.pdf
Michelle Hechler, Supriya Srivastav and Sebastian Schlücker

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Asian Journal of Physics                                                                                                       Vol. 30 No 2, 2021, 303-318


Vibrational dynamics via multidimensional electronic spectroscopy


Tobias Brixner

Institut für Physikalische und Theoretische Chemie, Universität Würzburg,

Am Hubland, 97074 Würzburg, Germany,

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Vibrational spectroscopy is commonly performed using infrared radiation for direct transitions between vibrational states or using visible radiation in a Raman process. As an alternative to narrowband lasers, broadband femtosecond pulses can be employed to excite vibrational wave packets whose temporal oscillations contain analogous information. In this review article, it is shown that coherent multidimensional electronic spectroscopy provides a generalization of this idea, such that vibrational information can be retrieved together with ultrafast dynamics and correlations between various electronically excited states. In particular, fluorescence-detected coherent two- and three-dimensional electronic spectroscopy is discussed. This can be realized in a single-beam geometry with shot-to-shot pulse shaping that allows for fast data acquisition and simultaneous measurement of 15 (or more) different four- and six-wave-mixing spectra. These provide information on higher electronically excited states, vibrational dynamics, and exciton transport, for example in supramolecular systems. Generalizations of this idea offer additional spatial resolution on a µm length scale in an optical microscope or even down to the few nm length scale using photoemission electron microscopy. Furthermore, the concept of signal detection was transferred to molecular beams and photoions. A topic of current interest is retrieving the full nonlinear tensor via polarization-shaped laser pulses. In general, multidimensional spectroscopy is a powerful strategy to systematically map out the response of a quantum system for increasing orders of nonlinearity in light–matter interaction. © Anita Publications. All rights reserved.

Keywords: Vibrational spectroscopy, Raman process, Photoions, Multidimensional spectroscopy  

Total Refs: 119

Vibrational dynamics via multidimensional electronic spectroscopy.pdf
Tobias Brixner

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Asian Journal of Physics                                                                                                                            Vol. 30 No 2, 2021, i-iii

Book Review
C V Raman and the Press: Scientific Reporting and Image Building  

(Part III: The Raman Research Institute Period)
Author: Dr. Rajinder Singh, University of Oldenburg, Germany.
Publishers: Shaker Publisher, Dueren, Germany,
Year of Publication 2020,
Pages XIV + 119 .
Price, Digital: 5,47 Euro, Paperback: 21,90 Euro.
ISBN: -- 978-3-8440-7520-5.
    The present book is the third and the last part of the trilogy entitled “C V Raman and the Press: Science Reporting and Image Building.” It chronicled Raman’s last phase of service career at the Raman Research Institute (RRI), Bangalore during 1948-1970. The first and the second parts of  the sequel profiled his life in Calcutta (1917-1933) and Bangalore(1933-1948).
book_review_C V Raman and the Press: Scientific Reporting and Image Building.pdf
Dr Anjana Chattopadhyay

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Asian Journal of Physics                                                                                                       Vol. 30 No 2, 2021, 303-318


Improved color properties of light emitting diodes with red phosphors and quantum dots


Jun Yeong Kim1, Hye-Rin Kim1, Yong Jin Lee1, In Sung Choi1, Jung-Gyun Lee1, Jae-Hyeon Ko1, Yongduk Kim2, Taehee Park3, and Young Wook Ko3

1School of Nano Convergence Technology, Hallym University, Chuncheon, Gangwondo 24252, Korea

2Cheorwon Plasma Research Institute, Cheorwon-gun, Gangwon-do, 24062, Korea

3GLVISION Co, Ltd., Geumgang-ro, Seo-myeon, Cheorwon-gun, Gangwon-do, 24062, Korea

This paper is dedicated to Prof Wolfgang Kiefer on the occasion of his 80th Birthday

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This paper presents the effect of red color-conversion materials on the emitting spectrum of typical light emitting diodes (LEDs) for general lighting applications. Conventional LEDs consist of blue LED chips and yellow phosphors lacking deep red in their emitting spectra. Addition of red phosphors or red quantum dots may improve the color-rendering properties of white LEDs. Either the K2SiF6:Mn4+(KSF) red phosphor or red CdSe/ZnS quantum dot was included in the white LED made by using blue LEDs and YAG(Y3Al5O12:Ce3+) green phosphors. Inclusion of red emitting materials enhanced the color rendering index(CRI) significantly, especially the R9 index associated with the strong red. In addition, it was found that the improved white LEDs could be used to enhance the color gamut of liquid crystal displays. © Anita Publications. All rights reserved.

Keywords: Light emitting diode, Phosphor, Quantum dot, Color rendering index, Color gamut

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Improved color properties of light emitting diodes with red phosphors and quantum dots.pdf
Jae-Hyeon Ko and et al

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