Communications

Subwavelength optical imaging through a silver nanorod

[+] Author Affiliations
Yuan-Fong Chau

Ching Yun University, Department of Electronic Engineering, Jung Li, Taiwan

Din Ping Tsai

National Taiwan University, Department of Physics and Center for Nanostorage Research, Taipei, Taiwan

Guang-Wei Hu

Chinese Army Academy, Department of Electrical Engineering, Kaohsiung, Taiwan

Lin-Fang Shen

Electromagnetic Academy, Department of Information Science and Electronic Engineering, Zhejiang Province, Hang Zhou 310027, China

Tzong-Jer Yang

National Chiao-Tung University, Department of Electrophysics, HsinChu 300, Taiwan

Opt. Eng. 46(3), 039701 (March 29, 2007). doi:10.1117/1.2715929
History: Received May 10, 2006; Revised September 21, 2006; Accepted September 26, 2006; Published March 29, 2007
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We numerically investigated subwavelength imaging in a silver nanorod of 50-nm height and 20-nm diam buried in dielectric background (SiO2) with a finite-difference time-domain (FDTD) method in the three dimensions. The near-field components of the Gaussian incident beam were plasmonically transferred through the input end of a silver nanorod to reproduce the light distributions of the incident wave at the output end. The field distributions were calculated at the different sectional planes of the rods, and it was found that the spatial resolution was less than 40nm given by the rod size, which is much beyond the diffraction limit of the conventional imaging system. The field intensity in the image plane was well resolved due to the collection of surface plasmon polaritons. The behaviors of the three components of field distribution at entrance and exit from the nanorod and the influences of the optical field distribution generated by some factors are also discussed in detail. The proposed structure possesses a deep transfer of super-resolution image and can be used with image transfer.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Yuan-Fong Chau ; Din Ping Tsai ; Guang-Wei Hu ; Lin-Fang Shen and Tzong-Jer Yang
"Subwavelength optical imaging through a silver nanorod", Opt. Eng. 46(3), 039701 (March 29, 2007). ; http://dx.doi.org/10.1117/1.2715929


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