Enhanced nonreciprocal thermal radiation properties of Graphene-based Magneto-optical materials

Han, Wenjuan; Lei, Yazhou; Jianfei, Han

doi:10.1016/j.optlastec.2021.107279

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…Magneto-optical materials hold promise for achieving higher optical information functional materials due to enhanced light trapping and photocarrier collection that can produce nonreciprocal effects 1 , 2 . Nonreciprocity violates Kirchhoff’s law by breaking the time reversal and detailed balance, 3 – 6 which has important application in nonreciprocal absorbers, such as thermal photovoltaics, solar cells, optical isolators, and infrared absorbers in the infrared field 7 – 11 Note that the nonreciprocal effect of magneto-optical materials is relatively weak in the visible and small infrared wavelength bands, and strong magneto-optical effects cannot be obtained even through an external magnetic field 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Nonreciprocal optical properties of magneto-optical film doped with metal particles based on the effective medium theory

2023

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In search of next-generation optical information functional materials, magnetooptical microstructures have attracted great attention since they can break Kirchhoff's law and produce higher photoelectric conversion efficiency. Theoretical studies using finite-difference time-domain and transfer matrix methods have been performed to investigate the optical properties of magneto-optical microstructures. However, these methods are computationally intensive and require periodic conditions, which may not be satisfied with most fabricated samples. The equivalent medium algorithm is improved to make it suitable for the equivalent of magnetooptical materials. Based on the improved equivalent medium theory (EMT), a magneto-optical InSb film structure doped with Au particles (D-InSb) is designed. The effective dielectric functions of the D-InSb layer for transfer matrix waves are obtained from the Bruggeman approximation. Thin-film optics formulas incorporating the anisotropic wave propagation in uniaxial media are employed to calculate the nonreciprocal absorptance of the D-InSb film. The effect of geometric parameters, such as filling ratio and number of layers, is investigated. In addition to modeling the directional radiative properties at various angles of incidence, the hemispherical properties are also calculated to understand the light absorption. The results of our study can provide methods and ideas for the design of solar cells, infrared absorbers, and optical isolators.

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Section: Introductionmentioning

confidence: 99%

Nonreciprocal optical properties of magneto-optical film doped with metal particles based on the effective medium theory

2023

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“…In recent years, there has been further developments in the design of nonreciprocal optical devices. In contrast to the developments of common nonreciprocal devices such as circulators and isolators, which focus on achieving contrast between various reflection or transmission processes, it was noted that complete contrast can be achieved between the absorption and thermal emission processes through the breaking of Kirchhoff’s law. − In particular, it has been pointed out in ref that Kirchhoff’s law can be broken in semitransparent structures, so that under ideal operation an absorber can fully absorb light from one direction while directing the emitted light solely to the opposite side.…”

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confidence: 99%

Reaching the Ultimate Efficiency of Solar Energy Harvesting with a Nonreciprocal Multijunction Solar Cell

2021

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The Landsberg limit represents the ultimate efficiency limit of solar energy harvesting. Reaching this limit requires the use of nonreciprocal elements. The existing device configurations for attaining the Landsberg limit, however, are very complicated. Here, we introduce the concept of a nonreciprocal multijunction solar cell and show that such a cell can reach the Landsberg limit in the idealized situation where an infinite number of layers are used. We also show that such a nonreciprocal multijunction cell outperforms a standard reciprocal multijunction cell for a finite number of layers. Our work significantly simplifies the device configuration required to reach the ultimate limit of solar energy conversion and points to a pathway toward using nonreciprocity to improve solar energy harvesting.

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Multi-band and wide-angle nonreciprocal thermal radiation

Chen

et al. 2023

International Journal of Heat and Mass Transfer

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Enhanced nonreciprocal thermal radiation properties of Graphene-based Magneto-optical materials

Cited by 8 publications

References 31 publications

Nonreciprocal optical properties of magneto-optical film doped with metal particles based on the effective medium theory

Nonreciprocal optical properties of magneto-optical film doped with metal particles based on the effective medium theory

Reaching the Ultimate Efficiency of Solar Energy Harvesting with a Nonreciprocal Multijunction Solar Cell

Multi-band and wide-angle nonreciprocal thermal radiation

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