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A design of nano‐optical Y agi‐ U da antenna with high forward directivity
Author(s) -
Chen Xiaolin,
Yu Wenhai,
Yue Wencheng,
Yao Peijun,
Liu Wen
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30399
Subject(s) - directivity , antenna (radio) , optics , near and far field , microwave , reflector (photography) , physics , materials science , optoelectronics , engineering , telecommunications , light source
Optical antennas, acting as converters between propagating and localized fields, can be employed in near‐field microscopy and high‐resolution biomedical sensors. Utilizing the multi‐sphere dyadic Green's function, we propose a nonperiodic optical nanoantenna made of a metallic nanoparticles dimer chain. Our numeric results show that the antenna has a high forward directivity and vanishing backward directivity simultaneously even without a reflector. Our work reveals the role of nonperiodicity in design of optical Yagi‐Uda nanoantenna. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:786–789, 2017