Dr. Saptaparna Das
Sr. Optical Engineer at Cymer LLC
SPIE Involvement:
Area of Expertise:
ultrafast spectroscopy in condensed phase and interfaces , characterization of organic and inorganic/hybrid photovoltaics , photo-lithography , optical properties of nanomaterials , triplet photophysics
Profile Summary

Sr. Optical Engineer, Cymer An ASML Company June 2016 – present
- Designing and performing experiments to analysis the optics lifetime for 193 nm light sources
- Designing and developing optical assemblies for 193 nm light sources
- Analyzing the damage for 193 nm optics and developing a new optics damage tester tool.

Postdoctoral Researcher, at University of Pennsylvania Aug 2015-May 2016
- Built a new 2D Electronic and 2D Infrared Spectrometer.
- Performed ultrafast multidimensional dynamics of artificial photosynthetic systems and donor-acceptor type molecules.
- Performed theoretical calculations to estimate electronic and vibrational transitions of various optically-active chromophores.

Graduate Research Assistant, University of Southern California, Advisor: Prof. Stephen Bradforth 2009-2015
- Performed transient absorption measurements to understand the physical reason behind a good/bad device performance of a polymer based organic photovoltaic and hybrid nano-structured photovoltaics.
- Performed time-resolved measurements to optimize the coupling required between two tetracenes to enhance the singlet fission yield in an isolated dimer molecule in the solution.
- Characterized the dynamics behind the generation of intramolecular charge transfer states in mimics of photosynthetic complexes.
Publications (3)

Proceedings Article | 16 November 2018 Paper
Saptaparna Das, John Melchior, Eric Mason
Proceedings Volume 10805, 1080526 (2018) https://doi.org/10.1117/12.2500240
KEYWORDS: Optical coatings, Fluorine, Crystals, Photons, Absorption, Surface finishing, Thin film coatings, Excimer lasers, Statistical analysis

Proceedings Article | 21 March 2018 Paper
Yzzer Roman, Ted Cacouris, Kumar Raja Guvindan Raju, Dinesh Kanawade, Walt Gillespie, Siqi Luo, Eric Mason, David Manley, Saptaparna Das
Proceedings Volume 10587, 1058716 (2018) https://doi.org/10.1117/12.2299387
KEYWORDS: Light sources, Neon, Deep ultraviolet, Carbon, Metals, Semiconducting wafers, Helium, Semiconductors, Nitrogen

Proceedings Article | 20 August 2015 Presentation + Paper
Saptaparna Das, Alia Latif, William Thornbury, Barry Thompson, Stephen Bradforth
Proceedings Volume 9549, 95490N (2015) https://doi.org/10.1117/12.2189531
KEYWORDS: Polarons, Polymers, Absorption, Chromophores, Doping, Interfaces, Excitons, Polymer thin films, Composites, Diffusion

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