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Published September 17, 2007 | public
Journal Article Open

Theory of resonantly enhanced near-field imaging


We investigate the fundamental issues of power transfer and far-field retrieval of subwavelength information in resonantly enhanced near-field imaging systems. It is found that high-quality resonance of the imaging system, such as that provided by dielectric resonators, can drastically enhance the power transfer from the object to the detector or the working distance. The optimal power transfer condition is shown to be the same as the critical coupling condition for resonators. The combination of a dielectric planar resonator with a solid immersion lens is proposed to project resonantly enhanced near-field spatial frequency components into the far field with the same resolution limit as that for solid immersion microscopy, but with much improved signal power throughput or working distance for resonant spatial frequencies.

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© 2007 Optical Society of America. Original Manuscript: August 1, 2007. Manuscript Accepted: August 31, 2007. Revised Manuscript: August 31, 2007. Published: September 5, 2007. Discussions with Zhiwen Liu, Zhenyu Li, Changhuei Yang, Yeshaiahu Fainman, Edward Yu, and Iam-Choon Khoo are gratefully acknowledged. This work is supported by the DARPA Center for Optofluidic Integration and the National Science Foundation through the Center for the Science and Engineering of Materials (DMR-0520565).


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