Profiles

Debanjan

Debanjan Polley

Postdoktor

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Works at Department of Physics
Telephone 08-553 787 20
Email debanjan.polley@fysik.su.se
Visiting address Roslagstullsbacken 21
Room A3:1029
Postal address Fysikum 106 91 Stockholm

About me

Hi, 

I am Debanjan Polley. I did my PhD in S. N. Bose National Centre for Basic Sciences, India on THz spectroscopy of nanomaterials. Then I joined Stefano Bonettis lab for my post doctoral research in March, 2017. I am presently involved in COMSOL simulation of THz metamaterials, PYTHON programming for THz data analysis and THz conductivity measurements of magnetic thin films. 

Education
PhD (2011-2016)

Thesis Title: Manipulating Terahertz Radiation Using Nanostructures (Dr. Rajib Kumar Mitra and Prof. Anjan Barman)

S. N. Bose National Centre for Basic Sciences, Kolkata, Inida (Calcutta University)

MSc (2009-2011) Physical Sciences (Kolkata, India)
BSc (2006-2009) Physics (India)

 

Post Doctoral Research

(2017-ongoing) Stockholm University (with Dr. Stefano Bonetti): Working on THz Spectroscopy and Magnetization Dynamics

 

Research

In my PhD, I studied opto-electronic properties of metallic nanostructures and carbon nanotubes in THz frequency range. I have experience in preparing metallic nanostructures in wet chemical methode and static MOKE measurements. I have worked in Matlab and Origin for analysing the data.

Currently, I am interested in THz time domain spectroscopy of magnetic thin films, mainly their conductivity. I am also involved in simulating field enhancement in different types of THz metamaterials and I am using COMSOL wave optics module (A commercial finite element methode simulation tool) for the simulations. I use Python for the data analysis.

 

Publications

A selection from Stockholm University publication database
  • 2018. Debanjan Polley (et al.). Journal of Physics D 51 (8)

    We study THz-driven spin dynamics in thin CoPt films with perpendicular magnetic anisotropy. Femtosecond magneto-optical Kerr effect measurements show that demagnetization amplitude of about 1% can be achieved with a peak THz electric field of 300 kV cm(-1), and a corresponding peak magnetic field of 0.1 T. The effect is more than an order of magnitude larger than observed in samples with easy-plane anisotropy irradiated with the same field strength. We also utilize finite-element simulations to design a meta-material structure that can enhance the THz magnetic field by more than an order of magnitude, over an area of several tens of square micrometers. Magnetic fields exceeding 1 Tesla, generated in such meta-materials with the available laser-based THz sources, are expected to produce full magnetization reversal via ultrafast ballistic precession driven by the THz radiation. Our results demonstrate the possibility of table-top ultrafast magnetization reversal induced by THz radiation.

Show all publications by Debanjan Polley at Stockholm University

Last updated: May 17, 2018

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