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太赫兹可调谐三维光子射流。

Terahertz tunable three-dimensional photonic jets.

作者信息

Rezaei Behrooz, Yahyapour Babak, Darafsheh Arash

机构信息

Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz, Tabriz, Iran.

Department of Engineering Physics, Polytechnique Montreal, Montreal, QC, Canada.

出版信息

Sci Rep. 2024 Jul 17;14(1):16522. doi: 10.1038/s41598-024-64158-6.

DOI:10.1038/s41598-024-64158-6
PMID:39019897
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11254925/
Abstract

Highly localized electromagnetic field distributions near the "shadow-side" surface of certain transparent mesoscale bodies illuminated by light waves are called photonic jets. We demonstrated formation of three-dimensional (3D) tunable photonic jets in terahertz regime (terajets, TJs) by dielectric micro-objects -including spheres, cylinders, and cubes-coated with a bulk Dirac semimetal (BDS) layer, under uniform beam illumination. The optical characteristics of the produced TJs can be modulated dynamically through tuning the BDS layer's index of refraction via changing its Fermi energy. It is demonstrated that the Fermi energy of BDS layer has a significant impact on tuning the optical characteristics of the produced photonic jets for both TE and TM polarizations. A notable polarization dependency of the characteristics of the TJs was also observed. The impact of obliquity of the incident beam was studied as well and it was demonstrated that electromagnetic field distributions corresponding to asymmetric photonic jets can be formed in which the intensity at the focal region is preserved in a wide angular range which could find potential application in scanning devices. It was found that the maximum intensity of the TJ occurs at a non-trivial morphology-dependent source-angle.

摘要

在光波照射下，某些透明中尺度物体“阴影侧”表面附近高度局域化的电磁场分布被称为光子喷流。我们展示了在太赫兹波段（太赫兹喷流，TJ）中，通过在均匀光束照射下，由涂有块状狄拉克半金属（BDS）层的介电微物体（包括球体、圆柱体和立方体）形成三维（3D）可调谐光子喷流。通过改变块状狄拉克半金属层的费米能来调节其折射率，可以动态调制所产生的太赫兹喷流的光学特性。结果表明，块状狄拉克半金属层的费米能对调节所产生的光子喷流在TE和TM偏振下的光学特性都有显著影响。还观察到太赫兹喷流特性的显著偏振依赖性。同时研究了入射光束倾斜度的影响，结果表明可以形成对应于非对称光子喷流的电磁场分布，其中焦点区域的强度在很宽的角度范围内得以保持，这在扫描设备中可能具有潜在应用。研究发现，太赫兹喷流的最大强度出现在一个与形态有关的非平凡源角度处。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/2a85a7c18755/41598_2024_64158_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/f44ea2a12a61/41598_2024_64158_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/73d830d967a7/41598_2024_64158_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/64453b71f609/41598_2024_64158_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d24c080db71f/41598_2024_64158_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/739adee356f2/41598_2024_64158_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d1251d7b5507/41598_2024_64158_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/0f80ebbc1814/41598_2024_64158_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d0be74e3b5f4/41598_2024_64158_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/2a85a7c18755/41598_2024_64158_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/f44ea2a12a61/41598_2024_64158_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/73d830d967a7/41598_2024_64158_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/64453b71f609/41598_2024_64158_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d24c080db71f/41598_2024_64158_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/739adee356f2/41598_2024_64158_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d1251d7b5507/41598_2024_64158_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/0f80ebbc1814/41598_2024_64158_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/d0be74e3b5f4/41598_2024_64158_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1c7c/11254925/2a85a7c18755/41598_2024_64158_Fig9_HTML.jpg

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