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Deep sub-wavelength size non-reciprocal emission/absorption device construction method and system

A deep subwavelength, non-reciprocal technology, used in nonlinear optics, instruments, optics, etc., can solve problems such as performance needs to be improved, and achieve the effect of reducing the geometric size of the structure, solving the larger size, and reducing the size of the structure

Active Publication Date: 2020-07-24
SHANGHAI JIAO TONG UNIV
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  • Deep sub-wavelength size non-reciprocal emission/absorption device construction method and system
  • Deep sub-wavelength size non-reciprocal emission/absorption device construction method and system
  • Deep sub-wavelength size non-reciprocal emission/absorption device construction method and system

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Embodiment example 1

[0087] In the presence of an external magnetic field, Kirchhoff's law of thermal radiation is broken, and at the same incident angle, the absorption ratio and emissivity are no longer equal. The invention proposes to completely break Kirchhoff's law by exciting the Berreman mode of the near-zero material layer and increasing the difference between the absorption ratio and the emissivity. Figure 4 for the invention figure 1 The emissivity and absorptivity of the near-zero material with different thicknesses as a function of incident angle and operating angular frequency of the double-layer structure when the applied magnetic field is 1T. For a specific implementation case, when the thickness of the near-zero material is 200nm and the incident angle is 40°, the difference between the absorption ratio and the emissivity can reach |Δ|=0.59; when the thickness of the near-zero material is 450nm, when the incident angle is 22.5°, The difference between the absorption ratio and the...

Embodiment example 2

[0091] According to the design principles proposed in the present invention, a sub-wavelength dielectric grating is added, and the design structure can support asymmetric Berreman mode and Epsilon-near-zero mode at the same time, which can realize multi-peak non-reciprocal emission. The thickness of the grating is 1.75 μm, width 3 μm, period 4.5 μm. For specific implementation cases, by using a grating structure to excite an asymmetric Epsilon-near-near mode, such as Figure 7 As shown, high emission and low absorption characteristics can be achieved under the same incident angle, and the position of the absorption peak is insensitive to the incident angle, and the angle condition only changes the height of the absorption peak. Figure 8 for the invention image 3 The change of the emission / absorption spectrum with the period size after adding the grating structure, the non-reciprocal emission and absorption characteristics realized by using the asymmetric Berreman mode are n...

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Abstract

The invention provides a deep sub-wavelength size non-reciprocal emission / absorption device construction method and system. The method comprises the following steps: s1, selecting a magnetic near-zeromaterial layer as an absorption layer, and selecting a high-reflection substrate as a reflection layer; s2, arranging a sub-wavelength grating structure with a high dielectric constant on the reflection layer and the absorption layer, wherein the height of the grating is tg, the width of the grating is w, and the period of the grating is p; s3, under the conditions of TM polarization (Ex, Hy, kz)and an external direct-current magnetic field B, applying an external magnetic field in the z direction; and S4, adjusting the size of the external magnetic field B and the thickness t of the absorption layer. The near-zero material of the deep sub-wavelength magnetism is utilized, the problem that the design performance of an existing thermal radiation emission (absorption) device cannot be adjusted and controlled is solved, and the reconfigurable non-reciprocal emission (absorption) function is achieved by changing the size of the external magnetic field.

Description

technical field [0001] The present invention relates to the technical field of emitting and absorbing devices, in particular to a construction method and system for deep subwavelength nonreciprocal emitting / absorbing devices, especially a deep subwavelength nonreciprocal perfect emission and perfect absorption Device construction method and system. Background technique [0002] Thermal emission / absorption devices are important components to realize the collection, utilization and conversion of radiant energy, and have important application values ​​in radiative refrigeration, far (near) field thermal photovoltaics, solar cells, etc. The thermal radiation characteristics of macroscopic objects are broad-spectrum, anisotropic, and non-polarized. In recent years, the rise of metamaterials and metasurfaces provides a new platform for regulating thermal radiation characteristics at subwavelength or even deep subwavelength scales. However, most current absorber / emitter designs ar...

Claims

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Application Information

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IPC IPC(8): G02F1/09
CPCG02F1/091G02F1/093
Inventor 赵长颖刘梦琦
Owner SHANGHAI JIAO TONG UNIV
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