85 citations · 532 across the 24 of their papers we have counts for
25 papers
Coherent Thermal Emission from Large-Scale Suspended Nanomechanical Membranes
Mitradeep Sarkar, Rajashree Haldankar, Julien Legendre +3
Thermal radiation is an abundant form of incoherent light. Generating coherent infrared light through incandescence promises a cheap alternative to the costly and epitaxially compl…
Mid-IR chirality and chiral thermal emission through twisting
Michael T. Enders, Mitradeep Sarkar, Evgenia Klironomou +4
Chirality in the mid-infrared spectral range plays a crucial role across physical, chemical, and biological sciences, yet sources of chiral infrared light do not currently exist. T…
Design of narrowband infrared emitters by hybridizing guided-mode resonance structures with van der Waals materials
Mehrdad Shokooh-Saremi, Maxime Giteau, Mitradeep Sarkar +1
In this paper, narrowband emitters have been designed using particle swarm optimization (PSO) in the 10-20 μm infrared range. The device structure consists of an anisotropic α-MoO3…
Hot-carrier thermophotovoltaic systems
Kartika N. Nimje, Maxime Giteau, Georgia T. Papadakis
A thermophotovoltaic (TPV) energy converter harnesses thermal photons emitted by a hot body and converts them to electricity. When the radiative heat exchange between the emitter a…
Deep-subwavelength Phase Retarders at Mid-Infrared Frequencies with van der Waals Flakes
Michael T. Enders, Mitradeep Sarkar, Aleksandra Deeva +5
Phase retardation is a cornerstone of modern optics, yet, at mid-infrared (mid-IR) frequencies, it remains a major challenge due to the scarcity of simultaneously transparent and b…
Retrieving optical parameters of emerging van der Waals flakes
Mitradeep Sarkar, Michael T. Enders, Mehrdad Shokooh-Saremi +5
High-quality low-dimensional layered and van der Waals materials are typically exfoliated, with sample cross sectional areas on the order of tens to hundreds of microns. The small…
Thermodynamic performance bounds for radiative heat engines
Maxime Giteau, Michela F. Picardi, Georgia T. Papadakis
Heat engines cannot generally operate at maximum power and efficiency, imposing a trade-off between the two. Here, we highlight the exact nature of this trade-off for engines that…
Maximal Violation of Kirchhoff's Law in Planar Heterostructures
Lu Wang, F. Javier García de Abajo, Georgia T. Papadakis
Violating Kirchhoff's law has so far required nonreciprocal materials patterned in microstructures. In these configurations, the excitation of a guided or polaritonic mode that lie…
Lithography-free directional control of thermal emission
Mitradeep Sarkar, Maxime Giteau, Michael Enders +1
Blackbody thermal emission is spatially diffuse. Achieving highly directional thermal emission typically requires nanostructuring the surface of the thermally emissive medium. The…
Design rules for active control of narrowband thermal emission using phase-change materials
Maxime Giteau, Mitradeep Sarkar, Maria Paula Ayala +2
We propose an analytical framework to design actively tunable narrowband thermal emitters at infrared frequencies. We exemplify the proposed design rules using phase-change materia…
Dynamic modulation of thermal emission -- a Tutorial
Michela Florinda Picardi, Kartika Narayan Nimje, Georgia T. Papadakis
Thermal emission is typically associated with a blackbody at a temperature above absolute zero, which exchanges energy with its environment in the form of radiation. Blackbody ther…
Perspective on Near-Field Radiative Heat Transfer
Mariano Pascale, Maxime Giteau, Georgia T. Papadakis
Although near-field radiative heat transfer was introduced in the 1950's, interest in the field has recently revived, as the effect promises improved performance in various applica…
Tight bounds and the role of optical loss in polariton-mediated near-field heat transfer
Mariano Pascale, Georgia T. Papadakis
We introduce an analytical framework for near-field radiative heat transfer in bulk plasmonic and polar media. Considering material dispersion, we derive a closed-form expression f…
Thermodynamics of light management in near-field thermophotovoltaics
Georgia T. Papadakis, Meir Orenstein, Eli Yablonovitch +1
We evaluate near-field thermophotovoltaic (TPV) energy conversion systems focusing in particular on their open-circuit voltage (Voc). Unlike previous analyses based largely on nume…
Deep subwavelength thermal switch via resonant coupling in monolayer hexagonal boron nitride
Georgia T. Papadakis, Christopher J. Ciccarino, Lingling Fan +3
Unlike the electrical conductance that can be widely modulated within the same material even in deep nanoscale devices, tuning the thermal conductance within a single material syst…
Experimental Demonstration of Dynamic Thermal Regulation using Vanadium Dioxide Thin Films
Ahmed M. Morsy, Michael T. Barako, Vladan Jankovic +6
We present an experimental demonstration of passive, dynamic thermal regulation in a solid-state system with temperature-dependent thermal emissivity switching. We achieve this eff…
Nonreciprocal metamaterial obeying time-reversal symmetry
Siddharth Buddhiraju, Alex Song, Georgia T. Papadakis +1
We introduce a class of non-Hermitian systems that break electromagnetic reciprocity while preserving time-reversal symmetry, and describe its novel polarization dynamics. We show…
Nonreciprocal radiative heat transfer between two planar bodies
Lingling Fan, Yu Guo, Georgia T. Papadakis +5
We develop an analytical framework for nonreciprocal radiative heat transfer in two-body planar systems. Based on our formalism, we identify effects that are uniquely nonreciprocal…
Broadening near-field emission for performance enhancement in thermophotovoltaics
Georgia T. Papadakis, Siddharth Buddhiraju, Zhexin Zhao +2
The conventional notion for achieving high efficiency in thermophotovoltaics (TPVs) is to use a monochromatic emission at a photon energy corresponding to the band gap of the cell.…
Experimental demonstration of tunable graphene hyperbolic metamaterial
Jeremy Brouillet, Georgia T. Papadakis, Harry A. Atwater
Tuning the macroscopic dielectric response on demand holds potential for actively tunable metaphotonics and optical devices. In recent years, graphene has been extensively investig…
Gate-tunable near-field heat transfer
Georgia T. Papadakis, Bo Zhao, Siddharth Buddhiraju +1
Active control over the flow of heat in the near-field holds promise for nanoscale thermal management, with applications in refrigeration, thermophotovoltaics, and thermal circuitr…
Ultra-light Å-scale Optimal Optical Reflectors
Georgia T. Papadakis, Prineha Narang, Ravishankar Sundararaman +4
High-reflectance in many state-of-the-art optical devices is achieved with noble metals. However, metals are limited by losses, and for certain applications, by their high mass den…
Optical Magnetism in Planar Metamaterial Heterostructures
Georgia T. Papadakis, Dagny Fleischman, Artur Davoyan +2
Harnessing artificial optical magnetism requires rather complex two- and three-dimensional structures, examples include split-ring and fishnet metamaterials and nanoparticles with…
Field-effect induced tunability in planar hyperbolic metamaterials
Georgia T. Papadakis, Harry A. Atwater
We demonstrate that use of the field effect to tune the effective optical parameters of a layered hyperbolic metamaterial leads to topological transitions in its dispersion charact…