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A Novel Design Method of Focusing-control Device by Modulating SPPs Scattering

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Abstract

A novel design method of focusing device with a desired focal length is proposed, which consists of a nanometal slit surrounded with the grooves with fixed width and depth. By numerical calculation and analytic derivation, a relation between the phases of the light scattering from slit and grooves and the groove positions is revealed. Under the linear approximation, a design formula of focusing device is deduced, from which the position parameters of the grooves can be easily obtained to modulate the phase of the scattering light. The transmitted field distribution through the illustrative structures designed according to the proposed method is simulated with finite-difference time-domain (FDTD) method. The results show a good agreement with the theoretical analysis, and that the focal length can be controlled in several micrometers distance away from the metal exit surface, which verifies the feasibility of the method to deign focus-controlled optical elements in wavelength scale in integrated optics.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant 60678028. The authors are grateful to Qingyan Wang at Peking University for theoretical discussions.

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Authors and Affiliations

  1. Department of Physics, Tsinghua University, Room 1201, Building 9003, Beijing, 100084, People’s Republic of China

    Fenghuan Hao

  2. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, People’s Republic of China

    Fenghuan Hao, Rui Wang & Jia Wang

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  1. Fenghuan Hao
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  2. Rui Wang
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  3. Jia Wang
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Correspondence to Fenghuan Hao.

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Hao, F., Wang, R. & Wang, J. A Novel Design Method of Focusing-control Device by Modulating SPPs Scattering. Plasmonics 5, 45–49 (2010). https://doi.org/10.1007/s11468-009-9113-3

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  • DOI: https://doi.org/10.1007/s11468-009-9113-3

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