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ASIAN JOURNAL OF PHYSICS

An International Peer Reviewed Research Journal
Frequency : Monthly,
ISSN : 0971 – 3093
Editor-In-Chief (Hon.) :
Dr. V.K. Rastogi
e-mail:[email protected]
[email protected]

 AJP ISSN : 0971 – 3093
Vol 30, No 4, April 2021

Asian
Journal of Physics

Volume 30, No 4, April 2021

A Special Issue Dedicated
to
Prof R S Sirohi
Guest Edited By : P Senthilkumaran
Anita Publications
FF-43, 1st Floor, Mangal Bazar, Laxmi Nagar, Delhi-110 092, India

Appreciation
Bishnu Pal

Prof Rajpal Sirohi has been my Gurubhai as we both have been graduate students of Prof. M S Sodha in late 1960s and early 1970s, respectively. However, since Professor Sirohi had graduated much earlier than me, I have had not much interactions with him as he used to work at IIT Madras till he joined IIT Delhi as its Director. Once in a while we would meet at conferences/professional events. During his Directorship @ IITD, at his request, I had accepted to serve as the Head of the Computer Services Center (CSC) for 3 years and hence has been a member of his team of HoDs and HoCs. I must say I have never encountered any problem during his Directorship and he never thrust on me any decision although the Directors of IITs enjoys enormous power. During my three-year stint as a HoC, I could organize two rounds of interviews for CSC’s academic staff colleagues and have had success in getting promoted a large number of stagnating backlogs for elevation to next higher level of the academic ladder. Without Prof. Sirohi’s support as Chairman of the Selection Committee it would not have been possible to benefit the CSC staff. As a scientist, Prof Sirohi is highly respected globally for his numerous and sustained contributions to Applied Optics education and research expertise in e.g. speckles, interferometry and instrumentation, for which he has also earned several awards including Distinguished Alumni award from IIT Delhi. One of his most prestigious scientific recognitions from abroad has been the coveted Alexander von Humboldt Prize from AvH Foundation (Germany) besides several awards from SPIE, UNESCO, ICO, etc. As Director he had introduced an innovative award for MTech students in the form of “Perfect 10” Gold medal award to a deserving graduating MTech student who scores CGPA of 10/10. This in my opinion has been an important student-oriented decision taken by him as Director of the institute. Interestingly, there were no such awards for Master of Technology students that existed till his Directorship though there existed a Presidents’ Gold Medal for a graduating B.Tech. student scoring highest CGPA.

More recently at his persuasion, I agreed to jointly guest edit with him his proposal for a special issue of Asian J Physics dedicated to Prof Sodha’s 89th birthday, which I enjoyed and the issue has already seen light of the day last month on February 8th when Prof Sodha was presented a soft copy of the special issue.

That Prof Sirohi still continues to teach (in USA) in spite of his age is an excellent news and I wish him many more years of active life for disseminating his knowledge to more and more students and young researchers in optics and photonics.

Bishnu Pal
Dean Engineering
Ecole Centrale School of Engineering
Mahindra University, Hyderabad, India
22 March, 2021

Articles under Press

Coherence holography and synthetic statistical optics: A tutorial review
Mitsuo Takeda, Wei Wang, Dinesh N Naik and Rakesh K Singh

Speckles and Singularities
Ruchi and P Senthilkumaran

Polarization patterns from superposition of non-concentric Laguerre-Gaussian beams
Sunil Vyas and Yuan Luo

Vortex beams and their mechanical properties
Devinder Pal Ghai

Designing of the tapered helical photonic metamaterial structure using multi-exposure phase-controlled interference lithography
Saurabh Pandey, Shereena Joseph and Joby Joseph

Evolution of elegant, standard, and modulated high order Hermite-Gaussian laser modes in free space
Hemant Kumar Meena, Bhavesh Pant and Brijesh Kumar Singh

Design of multi-wavelength dielectric metasurfaces using finite element software
Jerin Geogy George, Susan Thomas and Shanti Bhattacharya

Optical singularities due to reflection of a laser beam at a dielectric interface
Nirmal K Viswanathan

Laser-driven Phosphor-Converted Broadband White Light Source using Multilayer Phosphor Composition
Atul Kumar Dubey, Virendra Kumar, Dheeraj Kumar, Mayank Gupta, and Dalip Singh Mehta

Optical and Terahertz Response of Carbon Nanostructures
Arvind Singh and Sunil Kumar

Optical Fourier processing with hybrid polarization mask
B S Bhargava Ram, P Senthilkumaran

Digital Polarization holography: a new method to see the unseen
R K Singh

Single shot Fourier phase retrieval with complexity guidance
Kedar Khare

Asian Journal of Physics Vol. 30, No 4 (2021) 591-597

Vortex beams and their mechanical properties
Devinder Pal Ghai
Crescent Components and Systems, Delhi-110 042, India
This paper is dedicated to Padmashree Prof R S Sirohi

Light beams characterized by orbital angular momentum in the direction of propagation of the beam, often called phase singular or vortex beams, are described. Some of the important methods of generating vortex beams are discussed. We have developed a novel reflective device, an adaptive helical mirror (AHM) that can be used to generate vortex beams of both positive and negative topological charges. Topological charge of the vortex beam can be altered in magnitude and sign simply by varying the excitation voltage. Both computational and interferometric methods of detection of such beams are discussed. We have proposed a new technique of vortex detection based on lateral shear interferometer. Important properties and applications are also covered in the paper. © Anita Publications. All rights reserved.
Keywords: Adaptive helical mirror, Optical vortices, Optical angular momentum. Vortex beams, Phase singularity.

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Vortex beams and their mechanical properties.pdfDownload

 

Asian Journal of Physics Vol. 30, No 4 (2021) 599-603

Designing of the tapered helical photonic metamaterial structure using multi-exposure phase-controlled interference lithography

Saurabh Pandey, Shereena Joseph and Joby Joseph

Photonics Research Lab, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110 016, India

This paper is dedicated to Padma Shri Prof R S Sirohi

Three-dimensional Photonic crystal structures have complex geometry with periodic variation of optical constant in all three dimensions. Studies on the optical properties of such systems gain immense attention as the cost-effective laser interference lithography technique can effectively replace the existing complex fabrication techniques. Here, we have introduced a laser interference lithography technique based on phase-controlled multi-beam interference. The 4+1 beam interference pattern with multi-exposures provides the designed tapered complex helical structure. The beam engineering and phase pattern are explained, and the simulation techniques are discussed. The controlled exposure dosage and rotation of the k vector in the azimuthal plane offer the desired structure’s design. © Anita Publications. All rights reserved.
Keywords: Nanophotonics, Photonic crystals, Metamaterial, Light-emitting diodes, Integrated circuits.

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Designing of the tapered helical photonic metamaterial…..pdfDownload

 

Asian Journal of Physics Vol. 30, No 4 (2021) 623-632

Tissue phantom analysis through transmission Mueller polarimetry and differential Mueller matrix formalism: a concise review

Jerin Geogy George, Susan Thomas and Shanti Bhattachrya

Centre for NEMS and Nanophotonics,
Department of Electrical Engineering, IIT Madras, Chennai- 600 036, India

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Tissue phantom analysis through……Download
Asian Journal of Physics Vol. 30, No 4 (2021) 633-654

Optical and terahertz response of carbon nanostructures
Arvind Singh and Sunil Kumar
Femtosecond Spectroscopy and Nonlinear Photonics Laboratory,
Department of Physics, Indian Institute of Technology Delhi, New Delhi- 110 016, India
This paper is dedicated to Padmashree Prof R S Sirohi

In the last three decades or so, we have witnessed an extraordinary progress in the research and technology of carbon- based nanomaterials. Among the peculiar highlights are the discoveries of fullerene, the carbon nanotubes and the magnificent simple scotch tape exfoliated graphene. The unique photophysical properties of these different allotropic forms of the nanocarbon have opened up vast application possibilities in many fields of science and technology, with particular emphasis on optoelectronics and photonics. A prerequisite for many of these applications is a thorough understanding of the nature of the elementary and coupled excitations and also various dynamical processes involving them. Here, we present an overview of the recent excitement with the carbon nanostructures, in particular, the quantum dots, nanotubes and graphene. EWe discuss some of their very interesting properties investigated through optical and THz spectroscopic tools. At optical frequencies, the light emitting properties, the nonlinearities and ultrafast response have been presented, while, the low-energy response has been considered in terms of studies obtained by using THz time-domain spectroscopy. Finally, we conclude with some of the future prospects on the photophysics of carbon nanosystems in realistic applications. © Anita Publications. All rights reserved.
Keywords: Carbon nanostructures, Carbon nanotubes, Graphene, Quantum dots, Ultrafast optical processes, Terahertz spectroscopy.

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