58 citations · 76 across the 10 of their papers we have counts for
10 papers
First-Principles Prediction of Phonon-Mediated Infrared Optical Properties of WO Polymorphs
Sreerag Sundaram, Karthik Sasihithlu
Many crystals exhibit polymorphism, undergoing atomic rearrangements that result in unit cells belonging to different symmetry groups. These structural changes directly affect latt…
A first-principles approach for predicting infrared optical properties of solids
Sreerag Sundaram, Ziqi Guo, Dudong Feng +2
We present a simplified formalism for predicting infrared optical constants from first-principles calculations. Addressing limitations of the widely used four-parameter semi-quantu…
Design of radiative cooling paint coating and insights into its sub-ambient cooling behaviour
Bhrigu Rishi Mishra, Sreerag Sundaram, Karthik Sasihithlu
Recent developments in radiative cooling technologies have primarily focused on affordable paint coatings that are easy to fabricate and deploy. Using a systematic approach to obta…
Semi-analytical technique for the design of disordered coatings with tailored optical properties
Bhrigu Rishi Mishra, Nithin Jo Varghese, Karthik Sasihithlu
Disordered media coatings are finding increasing use in applications such as day-time radiative cooling paints and solar thermal absorber plate coatings which require tailored opti…
Achieving passive daytime radiative cooling via TiO/PDMS coating
Karthik Sasihithlu, Sreerag Sundaram, Bhrigu Rishi Mishra +1
The exponential growth in population and the increasing global temperature trickles down to an explosive demand in cooling and refrigeration. The vicious cycle of carbon footprint…
A coupled harmonic oscillator model to describe the near-field radiative heat transfer between nanoparticles and planar surfaces
Karthik Sasihithlu
When two objects made of a material which supports surface modes are brought in close proximity to each other such that the vacuum gap between them is less than the thermal wavelen…
Dynamic near-field heat transfer between macroscopic surfaces
Karthik Sasihithlu, Girish Agarwal
The dynamic heat transfer between two half-spaces separated by a vacuum gap due to coupling of their surface modes is modelled using the theory that describes the dynamic energy tr…
Van der Waals force assisted heat transfer for vacuum gap spacings
Karthik Sasihithlu, John Brian Pendry, Richard V. Craster
Phonons (collective atomic vibrations in solids) are more effective in transporting heat than photons. This is the reason why the conduction mode of heat transport in nonmetals (me…
A surface-scattering model satisfying energy conservation and reciprocity
Karthik Sasihithlu, Nir Dahan, Jean-Paul Hugonin +1
In order for surface scattering models to be accurate they must necessarily satisfy energy conservation and reciprocity principles. Roughness scattering models based on Kirchoff's…
Proximity Effects in Radiative Transfer
Karthik Sasihithlu, Arvind Narayanaswamy
Though the dependence of near-field radiative transfer on the gap between two planar objects is well understood, that between curved objects is still unclear. We show, based on the…