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SPS organises a seminar by Dr. Arijit Kumar De

SPS organises a seminar by Dr. Arijit Kumar De

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SPS organises a seminar by Dr. Arijit Kumar De
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SPS Seminar (Online)

School of Physical Sciences

Jawaharlal Nehru University

 

 Title: Optical trapping with femtosecond pulses: Excitements, challenges and opportunities

Speaker: Dr. Arijit Kumar De

Associate Professor, Department of Chemical Sciences, IISER Mohali

Date: 28 July 2021 (Wednesday) Time: 4:00 PM

Zoom Meeting ID: 997 7689 0577, Passcode: CS@SPS

Abstract

The theme of research in our group is to explore, through a combination of theory and experiment, a wide range of problems in condensed phase dynamics with applications in chemistry, biophysics and condensed matter physics. Following a quick overview of the different state-of-the-art spectroscopic techniques developed by us to explore ultrafast energy and charge transfer dynamics in a variety of systems, in this talk I will mainly focus on elaborating the concept of ‘escape potential’, arising from nonlinear optical force under femtosecond pulsed excitation, which was first theoretically envisaged by us and subsequently demonstrated through meticulous experiments. I will further discuss how we can harness optical nonlinearity to reverse the direction of force or to split a single trapping potential well into many wells which is promised to have far reaching applications in facile and controlled optical manipulation.

 

References (on optical trapping):

1.      A. Devi and A. K. De, Optics Express, 21485-21496, 24(9), 2016.

2.      A. Devi and A. K. De, Physical Review A, 023856 (1-9), 96(2), 2017.

3.      A. Dev and A. K. De, Journal of Optics (IOP Publishing), 065504 (1-6), 2017.

4.      A. Devi and A. K. De, Journal of the Optical Society of America B 35(2), 19(6), 244-250, 2018.

5.      A. Devi and A. K. De, Journal of Optics (IOP Publishing), 065502 (1-8), 21, 2019.

6.      A. Devi, S. S. Nair, and A. K. De, EPL (Europhysics Letters), 28002 (1-7), 126, 2019.

7.      A. Devi and A. K. De, JNP Letters (Journal of Nanophotonics), 020501 (1-8), 13(2), 2019.

8.      S. Yadav, A. Devi and A. K. De, Physical Review A, 023509 (1-9), 102, 2020.

9.      A. Devi and A. K. De, Physical Review A, 043511 (1-7), 102 (4), 2020.

10.  A. Devi, S. Yadav and A. K. De, Applied Physics Letters, 161102 (1-6), 117 (16), 2020.

11.  A. Devi and A. K. De, Physical Review Research, 043378 (1-5), 2 (4), 2020.

12.  A. Devi and A. K. De, Optics Communications, 126440 (1-12), 482, 2021.

13.  A. Devi, S. S. Nair, S. Yadav and A. K. De, Nanoscale Advances, 3288-3297, 3 (11), 2021.

14.  A. Devi and A. K. De, Physical Review Research, 033074 (1-21), 3, 2021.

A warm welcome to the modified and updated website of the Centre for East Asian Studies. The East Asian region has been at the forefront of several path-breaking changes since 1970s beginning with the redefining the development architecture with its State-led development model besides emerging as a major region in the global politics and a key hub of the sophisticated technologies. The Centre is one of the thirteen Centres of the School of International Studies, Jawaharlal Nehru University, New Delhi that provides a holistic understanding of the region.

Initially, established as a Centre for Chinese and Japanese Studies, it subsequently grew to include Korean Studies as well. At present there are eight faculty members in the Centre. Several distinguished faculty who have now retired include the late Prof. Gargi Dutt, Prof. P.A.N. Murthy, Prof. G.P. Deshpande, Dr. Nranarayan Das, Prof. R.R. Krishnan and Prof. K.V. Kesavan. Besides, Dr. Madhu Bhalla served at the Centre in Chinese Studies Programme during 1994-2006. In addition, Ms. Kamlesh Jain and Dr. M. M. Kunju served the Centre as the Documentation Officers in Chinese and Japanese Studies respectively.

The academic curriculum covers both modern and contemporary facets of East Asia as each scholar specializes in an area of his/her interest in the region. The integrated course involves two semesters of classes at the M. Phil programme and a dissertation for the M. Phil and a thesis for Ph. D programme respectively. The central objective is to impart an interdisciplinary knowledge and understanding of history, foreign policy, government and politics, society and culture and political economy of the respective areas. Students can explore new and emerging themes such as East Asian regionalism, the evolving East Asian Community, the rise of China, resurgence of Japan and the prospects for reunification of the Korean peninsula. Additionally, the Centre lays great emphasis on the building of language skills. The background of scholars includes mostly from the social science disciplines; History, Political Science, Economics, Sociology, International Relations and language.

Several students of the centre have been recipients of prestigious research fellowships awarded by Japan Foundation, Mombusho (Ministry of Education, Government of Japan), Saburo Okita Memorial Fellowship, Nippon Foundation, Korea Foundation, Nehru Memorial Fellowship, and Fellowship from the Chinese and Taiwanese Governments. Besides, students from Japan receive fellowship from the Indian Council of Cultural Relations.