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Method and system for constructing non-reciprocal emitting/absorbing device with deep subwavelength size

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: 2021-11-12
SHANGHAI JIAOTONG UNIV
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  • Method and system for constructing non-reciprocal emitting/absorbing device with deep subwavelength size
  • Method and system for constructing non-reciprocal emitting/absorbing device with deep subwavelength size
  • Method and system for constructing non-reciprocal emitting/absorbing device with deep subwavelength size

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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 present invention provides a method and system for constructing non-reciprocal emitting / absorbing devices with deep subwavelength dimensions, including: step S1: selecting a magnetic near-zero material layer as the absorbing layer, and selecting a high reflection substrate as the reflecting layer; step S2: A sub-wavelength grating structure with high dielectric constant is arranged on the reflective layer and the absorbing layer, and the height of the grating is t g , the width is w, and the period is p; step S3: under TM polarization (E x , H y , k z ), under the condition of an external DC magnetic field B, the external magnetic field is along the z direction; Step S4: Adjust the magnitude of the external magnetic field B and the thickness t of the absorbing layer. The invention solves the problem that the design performance of the existing thermal radiation emitting (absorbing) device cannot be adjusted by using the near-zero material of deep subwavelength magnetism, and realizes reconfigurable non-reciprocity by changing the size of the applied magnetic field Emitting (absorbing) function.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/09
CPCG02F1/091G02F1/093
Inventor 赵长颖刘梦琦
Owner SHANGHAI JIAOTONG UNIV
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