Weiliang Jin
Stanford University
OpticsPhysicsPlanarOrders of magnitude (time)Nonlinear systemThermal conductionScatteringMaterials scienceInversePhotonicsNear and far fieldCondensed matter physicsComputational physicsOptoelectronicsHeat transferWavelengthRadiative transferThermal radiationResonator
53Publications
20H-index
1,219Citations
Publications 66
Newest
#1Weiliang JinH-Index: 20
#2Sean MoleskyH-Index: 17
Last. Alejandro W. RodriguezH-Index: 41
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The super-Planckian features of radiative heat transfer in the near-field are known to depend strongly on both material and geometric properties. However, the relative importance and interplay of these two facets, and the degree to which they can be used to enhance heat transfer, remains an open question. Recently derived bounds through energy conservation suggest an enhancement factor (compared to blackbody) of c^{2}|\chi|^4/ (4 \Im\left[\chi\right]^{2} \omega^{2} d^{2})between extended stru...
#1Sean Molesky (Princeton University)H-Index: 17
#2Zin Lin (Harvard University)H-Index: 20
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
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Recent advancements in computational inverse-design approaches — algorithmic techniques for discovering optical structures based on desired functional characteristics — have begun to reshape the landscape of structures available to nanophotonics. Here, we outline a cross-section of key developments in this emerging field of photonic optimization: moving from a recap of foundational results to motivation of applications in nonlinear, topological, near-field and on-chip optics. Starting with a des...
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#1Adi PickH-Index: 10
#2Zin LinH-Index: 20
Last. Alejandro W. RodriguezH-Index: 41
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We derive analytical formulas quantifying radiative emission from subwavelength emitters embedded in triply resonant nonlinear \chi^{(2)}cavities supporting exceptional points (EP) made of dark and leaky modes. We show that the up-converted radiation rate in such a system can be greatly enhanced---by up to two orders of magnitude---compared to typical Purcell factors achievable in non-degenerate cavities, for both monochromatic and broadband emitters. We provide a proof-of-concept demonstrati...
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#1Chawin SitawarinH-Index: 11
#2Weiliang JinH-Index: 20
Last. Alejandro W. RodriguezH-Index: 41
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Typically, photonic waveguides designed for nonlinear frequency conversion rely on intuitive and established principles, including index guiding and band gap engineering, and are based on simple shapes with high degrees of symmetry. We show that recently developed inverse-design techniques can be applied to discover new kinds of microstructured fibers and metasurfaces designed to achieve large nonlinear frequency conversion efficiencies. As a proof of principle, we demonstrate complex, wavelengt...
#1Weiliang Jin (Princeton University)H-Index: 20
#2Riccardo Messina (Princeton University)H-Index: 22
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
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Radiative heat transfer between uniform plates is bounded by the narrow range and limited contribution of surface waves. Using a combination of analytical calculations and numerical gradient-based optimization, we show that such a limitation can be overcome in complicated multilayer geometries, allowing the scattering and coupling rates of slab resonances to be altered over a broad range of evanescent wavevectors. We conclude that while the radiative flux between two inhomogeneous slabs can only...
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May 14, 2017 in CLEO (Conference on Lasers and Electro-Optics)
#1Zin Lin (Harvard University)H-Index: 20
#2Weiliang Jin (Princeton University)H-Index: 20
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
view all 7 authors...
We apply a large-scale inverse design strategy based on topology optimization (TO) toward the automatic discovery of complex nanophotonic structures-new kinds of micropillars, photonic-cyrstal slabs, and waveguides comprising complicated arrangements of subwavelength dielectrics-exhibiting unusual nonlinear and spectral properties. The structures support multiple, tightly confined resonances at far-away wavelengths and exhibit the largest nonlinear confinement factors predicted thus far (oders o...
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#1Weiliang Jin (Princeton University)H-Index: 20
#2Riccardo Messina (CNRS: Centre national de la recherche scientifique)H-Index: 22
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
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We present a general framework for studying strongly coupled radiative and conductive heat transfer between arbitrarily shaped bodies separated by subwavelength distances. Our formulation is based on a macroscopic approach that couples our recent fluctuating volume-current (FVC) method of near-field heat transfer to the more well-known Fourier conduction transport equation, in which case the former can induce temperature gradients throughout the bodies. Although the FVC framework can in principl...
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#1Weiliang Jin (Princeton University)H-Index: 20
#2Riccardo MessinaH-Index: 22
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
view all 3 authors...
We describe a recently developed formulation of coupled conductive and radiative heat transfer (RHT) between objects separated by nanometric, vacuum gaps. Our results rely on analytical formulas of RHT between planar slabs (based on the scattering-matrix method) as well as a general formulation of RHT between arbitrarily shaped bodies (based on the fluctuating–volume current method), which fully captures the existence of temperature inhomogeneities. In particular, the impact of RHT on conduction...
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#1Riccardo Messina (University of Montpellier)H-Index: 22
#2Weiliang Jin (Princeton University)H-Index: 20
Last. Alejandro W. Rodriguez (Princeton University)H-Index: 41
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We derive exact analytical formulas for the radiative heat transfer between parallel slabs separated by vacuum and subject to arbitrary temperature profiles. We show that, depending on the derivatives of the temperature at points close to the slab-vacuum interfaces, the flux can exhibit one of several different asymptotic low-distance (d)behaviors, obeying either 1/{d}^{2},\phantom{\rule{0.16em}{0ex}}1/d or logarithmic power laws, or approaching a constant. Tailoring the temperature profil...
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#1You-Ling Chen (PolyU: Hong Kong Polytechnic University)H-Index: 24
#2Weiliang Jin (Princeton University)H-Index: 20
Last. Xuming Zhang (PolyU: Hong Kong Polytechnic University)H-Index: 62
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Physical science is rooted in measurement, but even this simple idea becomes complicated at the nanoscale. For example, how does one actually measure the charge of a single nanoparticle? Traditional electrical methods are limited to micrometer-sized objects, yet nanoparticle charge is a crucial parameter in fields spanning astronomy, optics, biochemistry, environmental engineering, and surface chemistry. In recent years, air pollution has become a severe threat to human health. The main pollutio...
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