Dr. Sujit Bandyopadhyay has extensive experience in optics engineering, having received multiple academic honors. He has over 10 years of research experience and has worked for several companies in optics design, simulation, and metrology. His skill sets include optical design, metrology techniques like SWLI and ellipsometry, simulation, and experimentation. He has managed technical projects and customers and presented his research widely.

1. SKILLS AND SPECIFIC
ACHIEVEMENTS
DR SUJIT BANDYOPADHYAY
READING,UK

2. INTRODUCTION
 Physics graduate from Presidency College, India
– Topped in Mathematics
 Postgraduate in Applied Physics, Calcutta University, India
– First position
 Doctorate in Optics Engineering from Bangor University, UK
– Completed in 2 years (Hands-on experience in usage of fibre optics
components and laser diodes)
– (Mathematical physics teaching  Trinity Centre)
 Broad working experience in Research Laboratories and industries
– RRCAT, Department of Atomic Energy, India, +10 yrs. R &D – Laser optics,
– RAL, Science and Technology Facility Council, UK, +5 yrs. Experiments – Laser-
Plasma-optics
– GEOLA (UK, Engineering – Laser optics),
– Photon Design (UK, 1 yr. Business Growth – Integrated Optics Modelling),
– Nanometrics (UK, ~3 yrs. Metrology Design – Simulation)

3. SKILL-SETS
 Optical Design Skill
– Design for Manufacture
 Metrology Skill
– Intensity Based Overlay (IBO)
– Diffraction Based Overlay (DBO)
– Scanning White Light Interferometry (SWLI)
– Ellipsometry
 Simulation Skill
– SWLI Fringe Simulation
 Development/Innovation Skill
 Experimental Skill
 Commercial Skill
 Management Skill
 Presentation Skill
 Personal Skill
 Project Handled
 Summary

4.  At CLF/RAL learnt basic Zemax usage :
– optical system specifications and optical beam path design
(AutoCAD)
 At Nanometrics trained on Advanced Zemax and
developed skills for optical design and modelling for
metrology applications
– Integration of diffraction (FDTD, Matlab)
and imaging (POP, Zemax)
– Sequential design: Refractive & Reflective Objective, system
– Non-Sequential design: LED, CAD model for Vias, Beamsplitter
Optical Design Skill

5. Design for Manufacture
 Finite Conjugate Image based overlay tool optical
Head (Nanometrics)
 Reflecting Objective (Nanometrics)
 Nd:YAG RGB laser (GEOLA,UK)
 Optical Components, Laser Image Relay, PC based
Shear Interferometer, Q-switched laser Oscillator
(RRCAT, India)
0
0.05
0.1
0.15
-1.5 -1 -0.5 0 0.5 1 1.5

6. Metrology Skill : IBO
Image Based Overlay (IBO)
Design of Camera Correlation Focusing (CCF)
The effect of asymmetric aberration and illumination on
TIS
Matlab processing for :
• Image processing, Pixel interpolation and image correlation
• Information content , Stepper Algorithm, regression
Pattern recognition using commercial software package

7. Metrology Skill : DBO
Diffraction Based Overlay (DBO)
 I have proposed an idea for beam alignment
for a diffraction based overlay tool scheme
 Tolerance Analysis on the optical design

8. Metrology Skill: SWLI
Scanning White Light Interferometry
SWLI PUPS

9. Metrology Skill : Ellipsometry
 Pattern Characterisation
Ellipsometry and Reflectometry data analysis
based on Nanodiffract RCWA simulation for
Critical Dimension (CD), Side Wall Angle(SWA),
pitch, height and thickness and noise estimation using Matlab
 System Simulation
Matlab simulation of the intensity output of an Spectroscopic Ellipsometer :
‘Source- Polariser-Rotating Compensator- Sample-Rotating Compensator-
Analyser-Detector’ (PCSCA) configuration using Mueller matrix formalism.
 Variation in Fibre coupling
Analysis of the geometric effect of chromatic focal shift on the coupling
between Ellipsometer and Spectrometer taking the asymmetric reflection
from wafer due to a spread in angle of incidence about the mean.

10. Thin Film Intensity signal
Scanposition
Substrate
Top surface
Top Surface Height
Bottom Surface Height
SIMULATION SKILL
SWLI
TSV

11. SWLI Simulation
Simulated SWLI Fringe Measured SWLI fringe
-8 -6 -4 -2 0 2 4 6
100
150
200
Tool Noise
Excellent Match

12. FvT 


 2)2(
2

])((2sin[)( max ttFItI 

13. Experimental Skill
 R & D at Laser Laboratory
 Laser-plasma Experiments
 Optical Alignment
 Free space and optical Fibre
 Design, Specifying, Testing
and Integration

14. Commercial Skill
 Strength in Physics and Mathematics. Was able to analyse and solve
critical customer issues for Nanometrics such as :
– Calculation of a correction factor for use of High NA Optics with SWLI
– Eliminating coherent Image noise due to back-reflections from
beamsplitter
– Finding Operating regime for TSV size to avoid light loss using FDTD in
Matlab
 At Photon Design, was the Technical Sales Manager with a responsibility to
work closely with customers all over the world and solve their problems.
 During my work at Central Laser Facility (CLF,RAL/STFC), played the central
role for liaising the CLF user community (researchers, professors,
students, staff) with the various internal units of CLF providing them right
support, services and resources.
– Collaborated extensively with the CLF user community; one such
collaboration resulted in creating an opportunity to work with the
scientists inside AWE (UK)
 At Nanometrics and Photon Design, worked frequently across multiple
time zones to accommodate USA and Asian working hours

15. MANAGEMENT SKILL
 Management of technical project (RRCAT) liaising with Division Leader
 Management of CLF customers (Facility users)
 Management of Business Agents (Photon Design)

16. Presentation Skill
 Research work presented in and outside UK at
Science meetings (Nanometrics, STFC, RRCAT),
Conferences (UK, Europe and India) and Academic
organisations (India)
– Author/Co-author of 86 publications including 28 Journal
papers, 51 Proceedings papers and 7 internal reports
– Recently SPIE accepted “White Light Interferometers:
Applications in Research and Industry,” for Oral
presentation in ICOP 2015
 Photon Design Software products demonstrated at
Conferences (USA, Europe)

17. Personal Skill
 Comfortable to work in cross-cultural environment
 Think critically to solve a problem
 Enjoy completing the task within a time boundary
 Self-starter and team-oriented
 Like to communicate with a broad community
 Skills to adapt to new technologies and propose ideas
 Willing to travel within job role
 Positive, cheerful outlook and hard working
 Passionate about learning

18. Project Handled
 Simulation of physics of UNIFIRE, a scanning white light interferometer for
wafer processing and characterisation (Nanometrics, UK)
 Optical design of ‘Finite Conjugate MOSAIC’, an Image based overlay tool
for semiconductor wafer inspection (Nanometrics, UK)
– Design of reflecting Objective for better overlay performance
 Diagnostics development of target areas of VULCAN, the
petawatt/terawatt high power laser facility at UK (RAL/STFC)
 Commercial development of nanosecond red, green and blue laser from
Nd:YAG host for pulsed holography application (GEOLA,UK)
 Controlling the polarisation dynamics of semiconductor laser devices like
VCSEL and SOA (UWB,UK)
 Feasibility study of employing SOA for ultra-fast optical switching
(UWB,UK)
 Laser induced shock wave study (RRCAT, India)
 Development of a National High Power laser chain facility (RRCAT, India)

19. Summary
I am an experienced and well-qualified optics
professional looking to develop skills further in
frontiers driven by innovative technology and
creative research
THANK YOU VERY MUCH