332 citations · 1k across the 12 of their papers we have counts for
12 papers
Light control with Weyl semimetals
Cheng Guo, Viktar S. Asadchy, Bo Zhao +1
Weyl semimetals are topological materials whose electron quasiparticles obey the Weyl equation. They possess many unusual properties that may lead to new applications. This is a tu…
Nonreciprocal Infrared Absorption via Resonant Magneto-optical Coupling to InAs
Komron Shayegan, Bo Zhao, Yonghwi Kim +2
Nonreciprocal elements are a vital building block of electrical and optical systems. In the infrared regime, there is a particular interest in structures that break reciprocity bec…
Violating Kirchhoff's Law of Thermal Radiation in Semitransparent Structures
Yubin Park, Viktar S. Asadchy, Bo Zhao +3
Kirchhoff's law of thermal radiation imposes a constraint on photon-based energy harvesting processes since part of the incident energy flux is inevitably emitted back to the sourc…
High-Performance Photonic Transformers for DC Voltage Conversion
Bo Zhao, Sid Assawaworrarit, Parthiban Santhanam +2
Direct current (DC) converters play an essential role in electronic circuits. Conventional high-efficiency DC voltage converters, especially step-up type, rely on switch-mode opera…
Controlling the dopant profile for SRH suppression at low current densities in 1330nm GaInAsP light-emitting diodes
Parthiban Santhanam, Wei Li, Bo Zhao +5
The quantum efficiency of double hetero-junction light-emitting diodes (LEDs) can be significantly enhanced at low current density by tailoring the spatial profile of dopants to su…
Sub-Wavelength Passive Optical Isolators Using Photonic Structures Based on Weyl Semimetals
Viktar Asadchy, Cheng Guo, Bo Zhao +1
We design sub-wavelength high-performing non-reciprocal optical devices using recently discovered magnetic Weyl semimetals. These passive bulk topological materials exhibit anomalo…
Integrated near-field thermo-photovoltaics for on-demand heat recycling
Gaurang R. Bhatt, Bo Zhao, Samantha Roberts +7
The energy transferred via thermal radiation between two surfaces separated by nanometers distances (near-field) can be much larger than the blackbody limit. However, realizing a r…
Axion-Field-Enabled Nonreciprocal Thermal Radiation in Weyl Semimetals
Bo Zhao, Cheng Guo, Christina A. C. Garcia +2
Objects around us constantly emit and absorb thermal radiation. The emission and absorption processes are governed by two fundamental radiative properties: emissivity and absorptiv…
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.…
High reflection from a one-dimensional array of graphene nanoribbons
Nathan Zhao, Zhexin Zhao, Ian Williamson +3
We show that up to 90% reflectivity can be achieved by using guided plasmonic resonances in a one-dimensional periodic array of plasmonic nanoribbon. In general, to achieve strong…
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…