IEEE Photonics Society

Boston Photonics Society Chapter

Boston Chapter of the IEEE Photonics Society

Seminars

Thursday
May 10, 2018
6:30 PM
 

MIT Lincoln Laboratory Forbes Road
 

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Design and Analysis of a Nanofabricated Interferometer for Interaction-Free Measurement with Electrons

Prof. Akshay Agarwal, Massachusetts Institute of Technology, Cambridge, MA

 

Prof. Akshay Agarwal, Massachusetts Institute of Technology, Cambridge, MA

Abstract:  Interaction-free measurement (IFM) has been proposed as a means of high-resolution, low-damage imaging of radiation-sensitive samples, such as proteins and biomolecules. The basic setup for IFM is a Mach-Zehnder interferometer (MZI). Recent progress in nanofabricated electron diffraction gratings has made it possible to incorporate an MZI in a transmission-electron microscope (TEM). In this talk, we will describe a modular, self-aligned, amplitude-division electron interferometer in a TEM. The interferometer consists of two 45-nm-thick silicon layers separated by 20 µm.  Further, we will discuss our calculations comparing the error probability and number of scattered electrons for IFM and classical imaging schemes, with and without an additional detector for scattered electrons, for a black and white sample, with this interferometer. The additional detector reduced error for the same number of scattered electrons by an order of magnitude, for both IFM and classical schemes. We will also investigate a sample re-illumination scheme based on updating priors after each round of illumination until a stopping criterion is met. Implementation of these methods is likely achievable with existing instrumentation and would result in improved resolution in low-dose electron microscopy.

 

Biography:  Akshay Agarwal is a graduate student in the Department of Electrical Engineering and Computer Science at MIT. He received his Bachelor's and Master's degrees in Electrical Engineering from the Indian Institute of Technology Bombay, India in 2014.

His current research focuses on electron diffraction and interferometry as part of the free-space quantum electron microscope project.

 

This meeting begins at 6:30 PM Thursday May 10th, 2018 and will be located 3 Forbes Road (a MIT Lincoln Laboratory facility), Lexington, MA, 02420.  The meeting is free and open to the public.  All are welcome. Prior to the seminar there will be social time and networking from 6:30 – 7:00PM.  Dinner will also be provided.   The seminar will begin at 7:00PM.  For more information contact Ajay Garg, Boston IEEE Photonics Society Chapter chair at ajay.garg@ll.mit.edu, or visit the Boston IEEE Photonics Society website at www.bostonphotonics.org.

 

Location:  MIT Lincoln Laboratory Forbes Road
 

Directions:  
3 Forbes Road

Lexington, MA 02420


Directions to MIT Lincoln Laboratory Forbes Road: (from interstate I-95/Route 128)


The Forbes site is off Marrett Road (Route 2A) which crosses Rte-128 at Exit 30. Please see the link below for more details: http://www.ll.mit.edu/about/mapForbesRoad.html