Latest Updates

Aug 2020:   Subhrokoli Ghosh defended his PhD thesis. Congrats Subhrokoli!    ***    July 2020:   Raunak Dey and Yatish Chandra defended their MS thesis. Congrats!   ***    July 2020:   Shuvojit Pal has been awarded prestigious Humboldt Research Fellowship for Postdoctoral Researchers. Congrats Shuvojit!    ***    May 2020:   Subhrokoli Ghosh has obtained a postdoc fellowship in Prof. Alexander Rohrbach's group at the University of Freiburg. Congrats Subhrokoli!    ***    Jan 2020:   Caroline Girmen from University of Münster, Germany joins Light-Matter lab as an exchange student under DUO-India programme. Welcome Caroline!    ***    Nov 2019:   Avijit Kundu wins DUO-India Fellowship. Congrats Avijit!    ***    Aug 2019:   Roshan Tiwari wins second prize in Bright Idea Competition organized by DSIR and IISER Kolkata. Congrats Roshan!    ***    Aug 2019:   Shuvojit Pal joined as a postdoc in the group of Prof. Clemens Bechinger at the University of Konstanz, Germany. Best wishes to Shuvojit for his future endeavours!    ***    Jul 2019:   Shuvojit Pal defended his PhD thesis. Congrats Shuvojit!    ***    Jun 2019:   Debapriya Pal wins the best MS thesis award (joint winner) in Physical Sciences for the year 2019.    ***    May 2019:   Debapriya Pal, Prithviraj Basak and Unnati Ashar defended their MS thesis. Congrats!   ***    May 2019:   Souvik Sil is one of the winners of the MKS Instruments Research Excellence Travel Awards for the year 2018-19.    ***    Oct 2018:   The guru of Optical Tweezers Arthur Ashkin wins Nobel Prize in Physics 2018!!! .    ***      Project grant received under DST IMPRINT.    ***      Project grant received under DST SERB.    ***                        

Light-Matter Lab | IISER Kolkata

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Our motto: Light Matters!

Welcome to our webpage!

Our group is primarily focused on light-matter interactions in the mesoscopic domain - where light interacts with micro or nano particles. More specifically, we employ the so-called 'optical tweezers' - where light is focused to sub-micron spot sizes to confine and manipulate single mesoscopic particles - to study light-matter interactions in the regime of classical physics. Even in the quantum side, we have facilities to probe the fascinating world of quantum optics through tunable diode laser spectrosopy on dilute atomic vapors, where we can perform electromagnetically induced transparency (EIT) experiments using alkali atoms.

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Lab News

August 2020: New paper 'Direct observation of the effects of spin dependent momentum of light in optical tweezers' has been published in APL Photonics.

June 2020: New paper 'Laser assisted self-assembly of diphenylalanine: emergence of robust waveguiding properties and Fano resonances' has been published in Journal of Material Chemistry C.

May 2020: New paper 'Rapid phase calibration of a spatial light modulator using novel phase masks and optimization of its efficiency using an iterative algorithm' has been published in Journal of Modern Optics.

Jan 2020: New paper 'Characterization of a photophoretic optical trap in air by measuring motional resonances of trapped absorbing mesoscopic particles' has been published in Asian Journal of Physics.

Jan 2020: Light Matter Lab welcomes DUO-India exchange programme student Caroline Girmen from the University of Münster, Germany.

Nov 2019: Light Matter Lab congratulates Avijit Kundu for winning DUO-India Fellowship.

Oct 2019: New paper 'A quantitative analysis of memory effects in the viscously coupled dynamics of optically trapped Brownian particles' has been published in Soft Matter.

Sep 2019: New paper 'Measurement of Van der Waals force using oscillating optical tweezers ' has been published in Applied Physics Letters.

Aug 2019: Light Matter Lab congratulates Ram Nandan Kumar and Yatish Chandra for being awarded CSIR Junior Research Fellowship.

Aug 2019: Light Matter Lab congratulates Shuvojit Pal for joining as a postdoc in the group of Prof. Clemens Bechinger at the University of Konstanz, Germany.

Jul 2019: Light Matter Lab congratulates Shuvojit Pal for successfully defending his PhD Thesis.

May 2019: New paper 'Self-assembly and complex manipulation of colloidal mesoscopic particles by active thermocapillary stress' has been published in Soft Matter.

May 2019: Light Matter Lab congratulates Debapriya Pal, Prithviraj Basak and Unnati Ashar for successfully defending their Masters Thesis.

Project grant received under DST IMPRINT and DST SERB.

Mar 2019: New paper 'Active microrheology to determine viscoelastic parameters of Stokes-Oldroyd B fluids using optical tweezers' has been published in Journal of Physics Communications.

July 2018: New paper 'Free and confined Brownian motion in viscoelastic Stokes–Oldroyd B fluids' has been published in Journal of Physics: Condensed Matter.

Aprl 2018: Our work 'Two-point active microrheology in a viscous medium exploiting a motional resonance excited in dual-trap optical tweezers' has been highlighted by Nature India.

Aprl 2018: Light Matter Lab congratulates Mayuri Kawale, Randhir Kumar and Umang Jain for successfully defending their Masters Thesis.

Aprl 2018: Light Matter Lab congratulates Souvik Sil for being awarded CSIR Senior Research Fellowship.

Aprl 2018: New paper 'Two-point active microrheology in a viscous medium exploiting a motional resonance excited in dual-trap optical tweezers' has been published in Phys. Rev. E.

Nov 2017: Our paper 'Dual-mode optical fiber-based tweezers for robust trapping and manipulation of absorbing particles in air' has become The paper of the week for the duration 21st Nov - 27th Nov, 2017.

Nov 2017: Our paper 'Using Brownian motion to measure shape asymmetry in mesoscopic matter using optical tweezers' has become the leading article among 2016's most accessed Soft Matter articles.

Nov 2017: New paper 'Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators' has been published in Phys. Rev. E (Rapid Comm.).

Oct 2017: New paper 'Dual-mode optical fiber-based tweezers for robust trapping and manipulation of absorbing particles in air' has been published in Journal of Optics (Letters).

July 2017: Highlight in Nature India, Times of India, Ahmedabad Mirror, newsX, Business Standard, and india news.

June 2017: New paper 'In situ self-assembly and photopolymerization for hetero-phase synthesis and patterning of conducting materials using soft oxometalates in thermo-optical tweezers' has been published in Journal of Materials Chemistry C.

May 2017: Light Matter Lab congrats Tushar Saha for winning 2nd prize in best MS Thesis award 2017 in IISER Kolkata

Jan 2017: New paper 'Fast Bayesian inference of optical trap stiffness and particle diffusion' has been published in Nature Scientific Reports.

Dec 2016: Souvik Sil received one of the best poster award in 25th National Laser Symposium for the poster titled "Quantification of Photophoretic Forces from Measurments of the Brownian Dynamics of Optically Trapped Absorbing Particles".

Sept 2016: New paper 'Simultaneous measurement of mass and rotation of trapped absorbing particles in air' has been published in Optics Letters.

July 2016: Former lab member Dr. Basudev Roy has been offered faculty position at IIT- Madras.

June 2016: Highlight in Nature India.

May 2016: New paper 'Using Brownian motion to measure shape asymmetry in mesoscopic matter using optical tweezers' has been published in Soft Matter.