Chinmay Khandekar
Purdue University
Magnetic fieldPhoton upconversionOpticsPhysicsOrders of magnitude (time)RadiationAngular momentumBlack-body radiationNonlinear systemPhotonEmissivityAtomic physicsMaterials scienceThermalPhotonicsNear and far fieldCondensed matter physicsComputational physicsMolecular physicsOptoelectronicsHeat transferSpin (physics)Thermal fluctuationsThermal radiationBistability
31Publications
9H-index
155Citations
Publications 26
Newest
#1Chinmay KhandekarH-Index: 9
#2Weiliang JinH-Index: 15
Last. Shanhui FanH-Index: 143
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Detection of infrared (IR) photons in a room-temperature IR camera is carried out by a two-dimensional array of microbolometer pixels which exhibit temperature-sensitive resistivity. When IR light coming from the far-field is focused onto this array, microbolometer pixels are heated up in proportion to the temperatures of the far-field objects. The resulting resistivity change of each pixel is measured via on-chip electronic readout circuit followed by analog to digital (A/D) conversion, image p...
#1Yifan Wang (Purdue University)
#2Chinmay Khandekar (Purdue University)H-Index: 9
Last. Zubin Jacob (Purdue University)H-Index: 35
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We numerically demonstrate that a planar slab made of magnetic Weyl semimetal (a class of topological materials) can emit high-purity circularly polarized (CP) thermal radiation over a broad mid- and long-wave infrared wavelength range for a significant portion of its emission solid angle. This effect fundamentally arises from the strong infrared gyrotropy or nonreciprocity of these materials, which primarily depends on the momentum separation between Weyl nodes in the band structure. We clarify...
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#2Chinmay KhandekarH-Index: 9
Last. Zubin JacobH-Index: 35
view all 6 authors...
We numerically demonstrate that a planar slab made of magnetic Weyl semimetal (a class of topological materials) can emit high-purity circularly polarized (CP) thermal radiation over a broad mid- and long-wave infrared wavelength range for a significant portion of its emission solid angle. This effect fundamentally arises from the strong infrared gyrotropy or nonreciprocity of these materials which primarily depends on the momentum separation between Weyl nodes in the band structure. We clarify ...
#1Chinmay KhandekarH-Index: 9
Last. Shanhui FanH-Index: 143
view all 7 authors...
We show that an isotropic dipolar particle in the vicinity of a substrate made of nonreciprocal plasmonic materials can experience a lateral Casimir force and torque when the particle's temperature differs from that of the slab and the environment. We connect the existence of the lateral force to the asymmetric dispersion of nonreciprocal surface polaritons and the existence of the lateral torque to the spin-momentum locking of such surface waves. Using the formalism of fluctuational electrodyna...
#1Xingyu GaoH-Index: 14
#2Chinmay KhandekarH-Index: 9
Last. Tongcang LiH-Index: 26
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Spin and orbital angular momentum of light play a central role in nanophotonics as well as topological electrodynamics. Here, we show that the thermal radiation from finite-sized bodies comprising of nonreciprocal magneto-optical materials carries a net angular momentum flux. Such angular momentum loss gives a nontrivial temperature-dependent torque on bodies which can be measured experimentally. We combine Rytov's fluctuational electrodynamics with the theory of optical angular momentum to calc...
#1Xueji WangH-Index: 1
#2Ryan Starko-BowesH-Index: 5
Last. Zubin Jacob (Purdue University)H-Index: 35
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Controlling and detecting thermal radiation is of vital importance for varied applications ranging from energy conversion systems and nanoscale information processing devices to infrared imaging, spectroscopy and sensing. We review the field of high temperature thermal photonics which aims to control the spectrum, polarization, tunability, switchability and directionality of heat radiation from engineered materials in extreme environments. We summarize the candidate materials which are being pur...
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#1Li-Ping Yang (Purdue University)H-Index: 11
#2Chinmay Khandekar (Purdue University)H-Index: 9
Last. Zubin Jacob (Purdue University)H-Index: 35
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We show that a single photon pulse (SPP) incident on two interacting two-level atoms induces a transient entanglement force between them. After absorption of a multi-mode Fock state pulse, the time-dependent atomic interaction mediated by the vacuum fluctuations changes from the van der Waals interaction to the resonant dipole-dipole interaction (RDDI). We explicitly show that the RDDI force induced by the SPP fundamentally arises from the two-body transient entanglement between the atoms. This ...
2 CitationsSource
#1Chinmay Khandekar (Purdue University)H-Index: 9
#2Li-Ping Yang (Purdue University)H-Index: 11
Last. Zubin Jacob (Purdue University)H-Index: 35
view all 4 authors...
Nearly all thermal radiation phenomena involving materials with linear response can be accurately described via semi-classical theories of light. Here, we go beyond these traditional paradigms to study a nonlinear system that, as we show, requires quantum theory of damping. Specifically, we analyze thermal radiation from a resonant system containing a χ(2) nonlinear medium and supporting resonances at frequencies ω1 and ω2 ≈ 2ω1, where both resonators are driven only by intrinsic thermal fluctua...
2 CitationsSource
#1Parijat Sengupta (Purdue University)H-Index: 8
#2Chinmay Khandekar (Purdue University)H-Index: 2
Last. Zubin JacobH-Index: 35
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We study the interplay of electron and photon spin in non-reciprocal materials. Traditionally, the primary mechanism to design non-reciprocal photonic devices has been magnetic fields in conjunction with magnetic oxides, such as iron garnets. In this work, we present an alternative paradigm that allows tunability and reconfigurability of the non-reciprocity through spintronic approaches. The proposed design uses the high-spin-orbit coupling of a narrow-band gap semiconductor (InSb) with ferromag...
3 CitationsSource
The interplay of spin angular momentum and thermal radiation is a frontier area of interest to nanophotonics as well as topological physics. Here, we show that a thick planar slab of a nonreciprocal material, despite being at thermal equilibrium with its environment, can exhibit nonzero photon spin angular momentum and nonzero radiative heat flux in its vicinity. We identify them as the persistent thermal photon spin (PTPS) and the persistent planar heat current (PPHC) respectively. With a pract...
19 CitationsSource