Experimental Study of Metallic Elliptical Nano-Pinhole Structure-Based Plasmonic Lenses |
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Authors: | Yiwei Zhang Yongqi Fu Yu Liu Xiuli Zhou |
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Institution: | (1) School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan Province, People’s Republic of China; |
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Abstract: | An elliptical nano-pinhole structure-based plasmonic lens was designed and investigated experimentally by means of focused
ion beam nanofabrication, atomic force microscope imaging, and scanning near-field optical microscope (NSOM). Two scan modes,
tip scan and sample scan, were employed, respectively, in our NSOM measurements. Both the scan modes have their characteristics
while probing the plasmonic lenses. Our experimental results demonstrated that the lens can realize subwavelength focusing
with elongated depth of focus. This type of lens can be used in micro-systems such as micro-opto-electrical–mechanical systems
for biosensing, subwavelength imaging, and data storage. |
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Keywords: | |
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