Donuts make diffractionless electromagnetic waves

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/103288

Title:	Donuts make diffractionless electromagnetic waves
Authors:	陳啟昌;Tsai, Ya-Lun;Lu, Jyun-Hong;Chiu, Hua-Kung;Chen, Ching-Yi;Chen, Chii-Chang;Chang, Jenq-Yang
Contributors:	理學院光電科學與工程學系
Keywords:	Beam characteristics: profile, intensity, and power;spatial pattern formation;Beams (radiation);Bessel function;Diffraction;Diffractionless beam;Electromagnetic waves;Exact sciences and technology;Fundamental areas of phenomenology (including applications);Laser optical systems: design and operation;Lasers;Microwaves;Nanostructure;Optical elements, devices, and systems;Optical materials;Optical waveguides and coupleurs;Optics;Photonic bandgap;Photonic bandgap materials;Physics;Waveguides;Wavelengths
Date:	2012-01-01
Issue Date:	2026-04-23 11:27:15 (UTC+8)
Publisher:	Elsevier;Tokyo: Elsevier B.V
Abstract:	摘要： ► A diffractionless beam can be obtained using periodically arranged donut (torus) waveguides. ► The Bessel like field distribution is observed at the output of the waveguide. ► The diameter of the diffractionless beam is of the order of magnitude of the wavelength. ► The structure may be built for electromagnetic waves of any wavelength, including radiowaves, microwaves, infrared light, visible light and UV light. This work finds that a diffractionless beam can be obtained using periodically arranged donut (torus) waveguides. The Bessel-like field distribution is observed at the output of the waveguide. The structure may be built for electromagnetic waves of any wavelength, including radiowaves, microwaves, infrared light, visible light and UV light. The diameter of the diffractionless beam is of the order of magnitude of the wavelength. For UV light, the structure can be used in near-field high density storage or photolithography. For high-power visible or infrared laser such as a CO2 laser or tera-Watt lasers, the structure can replace collimation lenses to reduce absorption and Fresnel loss. For radiowaves and microwaves, the structure can help directional antenna increase the antenna gain for radar scanning, or highly secure and low-loss communications. The gain media confined in the structure can be adopted to enhance the Purcell effect and thus producing a low-loss and zero-threshold laser. 出版者： Tokyo: Elsevier B.V 出版日期： 2012-01 出處： Photonics and nanostructures, 2012-01, Vol.10 (1), p.9-15 版權： 2011 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 1569-4410 識別號： EISSN: 1569-4429 識別號： DOI: 10.1016/j.photonics.2011.08.007
Appears in Collections:	[Department of Optics and Photonics] journal & Dissertation

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