Seminar by B. Roy, 24 May 2023

Basudev Roy.
Study of out-of-plane rotations in optical tweezers and applications in soft matter and biological systems
Basudev Roy
Indian Institute of Technology Madras, India
Date: 24 May 2023
Time: 12:30
Place: Nexus

A rigid body can have 6 degrees of freedom, namely the three translational degrees of freedom and the three rotational degrees of freedom. Of these, the translational degrees have been well explored in optical tweezers community. However, only the in-plane rotational degree of freedom has been explored. We call this in-plane degree of rotational freedom, the yaw motion in the nomenclature of the airlines. The pitch and roll degrees are only beginning to be explored recently.

In this talk, I will show you 4 ways of generating pitch rotation using the optical tweezers. I will also show you one way of detection of pitch rotation at high resolution using birefringent particles. Further, I will discuss some applications of this pitch rotation in soft matter systems and biology. I will also show you a few other projects that we are working on inside the lab.

Basudev Roy got his MSc from Indian Institute of Technology Kharagpur and MS from the University of Maryland, College Park. He got his PhD from Indian Institute of Science Education and Research, Kolkata in 2015. He was an Alexander von Humboldt fellow at the University of Tuebingen, Germany for his postdoctoral research from 2015 to 2017. He joined Indian Institute of Technology Madras, India since 2017 where he is now an Associate Professor.

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