Karthik Sasihithlu

Karthik Sasihithlu

Assistant Professor


Academic Background:

  • M.S 2010; Ph.D 2013; Columbia University, New York
  • B.Tech 2008; NIT Karnataka, Surathkal

Contact Address:

7th floor, Department of Energy Science and Engineering Opposite Kendriya Vidyalaya School IIT Powai

(0091 22) - 2576 9347

Research Interest:

  • Light-matter interaction, metamaterials, hyperbolic materials
  • Thin film solar photovoltaics
  • Heat Transfer Physics, Thermal boundary resistance

Courses Offered:

  • Utilization of solar thermal energy (Spring 2018-19)
  • Physics for Energy Science (Fall 2019-20)

List of Publications:

  1. Phonon assisted heat transfer across a vacuum gap; J.B. Pendry, K. Sasihithlu, R. Craster; Physical Review B 94, 075414 (2016); http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.075414
  2. Van der Waals force assisted heat transfer; K. Sasihithlu, J.B. Pendry, R. Craster; Zeitschrift fr Naturforschung A72.2 (2017); https://www.degruyter.com/view/j/zna.2017.72.issue-2/zna-2016-0361/zna-2016-0361.xml
  3. A surface-scattering model satisfying energy conservation and reciprocity; K. Sasihithlu, N. Dahan, J-P Hugonin, J-J Greffet; Journal of Quantitative Spectroscopy and Radiative Transfer 171, 4-14 (2016); http://www.sciencedirect.com/science/article/pii/S0022407315300601
  4. Light Trapping in Ultrathin CIGS Solar Cell With Absorber Thickness of 0.1 μm; K. Sasihithlu, N. Dahan, J-J Greffet; IEEE Journal of Photovoltaics (2017); https://ieeexplore.ieee.org/document/8288696/
  5. Near-field radiative transfer between two unequal sized spheres with large size disparities; K. Sasihithlu and A. Naryanaswamy; Optics Express 22 (12), 14473-14492 (2013) https://www.osapublishing.org/oe/abstract.cfm?uri=oe-22-12-14473
  6. Phonon transport across a vacuum gap; D. P. Sellan, E. S. Landry, K. Sasihithlu, A. Narayanaswamy, A. McGaughey, and C. Amon. Physical Review B, 85, 024118 (2012) http://journals.aps.org/prb/abstract/10.1103/PhysRevB.85.024118
  7. Convergence of vector spherical wave expansion method applied to near-field radiative transfer; K. Sasihithlu and A. Naryanaswamy; Optics Express, Vol. 19, Issue S4, pp. A772-A785 (2011); https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-S4-A772
  8. Proximity effects in radiative heat transfer; K. Sasihithlu and A. Naryanaswamy; Physical Review B (Rapid communications), 83(16), 161406 (2011); http://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.161406
  9. [Commentary] Heat transferred in a previously unknown way K. Sasihithlu Nature 576, 216-217 (2019) https://www.nature.com/articles/d41586-019-03729-4?draft=collection
  10. Coupled harmonic oscillator model to describe surface-mode mediated heat transfer K. Sasihithlu Journal of Photonics for Energy, 9(3) (2018)
  11. Dynamic near-field heat transfer between planar surfaces for nanometric gaps K. Sasihithlu, G. Agarwal Nanophotonics, 7(9), (2018)

Work Experience:

  • Marie Curie Fellow, Imperial College London
  • Postdoctoral researcher, Institut d'Optique, France

Additional Information:

Ongoing projects:
1) Development of selective emitter coatings to reduce solar heating in homes
( 1 year, from July 2019) (Funded by La Fondation Dassault Systèmes)

The objective of this project is to design a selective emitter which when coated on the walls of enclosures will lead to decrease in temperature of the interior space of the enclosure through passive cooling. The required thermal and electromagnetic properties of the emitter is being designed using ABAQUS and CST Studio respectively.
Students currently working on this topic :
Bhrigu Rishi Mishra (PMRF fellow)
Sreerag Sundaraman (MSc student)
Nithin Jo Varghese (Project Associate)

2) Modelling of Forster Resonance Energy Transfer (FRET) and comparison with Near-field heat transfer
The objective of this project is to arrive at a common framework to model FRET and near-field heat transfer using coupled-harmonic oscillator model, and compare the strength of coupling parameters which lead to these phenomena
Students currently working on this topic :
Amit Upadhyaya (MSc-PhD 2017 batch)

3) Increasing optical absorption in Perovskite solar cells and organic solar cells
The objective of this project is to explore methods such as employing a layer of white paint to increase light absorption in thin-film solar cells such as in organic and Perovskite solar cells.
Students working on this topic: Dr. Anil Tumuluri (Institute postdoc)
Samiulla Ansari (MTech 2020)

4) Modelling and measurement of thermal boundary resistance between metals and insulators
The objective of this project is to model the thermal boundary resistance between metals and insulators using a coupled harmonic oscillator model and verify this using experimental techniques such as 3-omega technique.
Students currently working on this topic:
Anjali S (PhD student, 2019 batch)
Romal Kumar (Dual Degree student, 2015 batch)