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Raghunathan SB, Schouten HF, Ubachs W, et al. Dynamic beam steering from a subwavelength slit by selective excitation of guided modes. Phys Rev Lett. 2013;111(15):153901doi: 10.1103/PhysRevLett.111.153901.
Raghunathan, S. B., Schouten, H. F., Ubachs, W., Kim, B. E., Gan, C. H., & Visser, T. D. (2013). Dynamic beam steering from a subwavelength slit by selective excitation of guided modes. Physical review letters, 111(15), 153901. https://doi.org/10.1103/PhysRevLett.111.153901
Raghunathan, S B, et al. "Dynamic beam steering from a subwavelength slit by selective excitation of guided modes." Physical review letters vol. 111,15 (2013): 153901. doi: https://doi.org/10.1103/PhysRevLett.111.153901
Raghunathan SB, Schouten HF, Ubachs W, Kim BE, Gan CH, Visser TD. Dynamic beam steering from a subwavelength slit by selective excitation of guided modes. Phys Rev Lett. 2013 Oct 11;111(15):153901. doi: 10.1103/PhysRevLett.111.153901. Epub 2013 Oct 08. PMID: 24160601.
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Phys Rev Lett. 2013 Oct 11;111(15):153901. doi: 10.1103/PhysRevLett.111.153901. Epub 2013 Oct 08.

Dynamic beam steering from a subwavelength slit by selective excitation of guided modes.

Physical review letters

S B Raghunathan, H F Schouten, W Ubachs, B Ea Kim, C H Gan, T D Visser

Affiliations

  1. Department of Electrical Engineering, Delft University of Technology, 2628 CD Delft, Netherlands.

PMID: 24160601 DOI: 10.1103/PhysRevLett.111.153901

Abstract

Dynamic control of the direction of radiation of the light emanating from a subwavelength slit carved out of a thin metal film is experimentally demonstrated. This is achieved by selective excitation of the individual guided modes in the slit by setting the phase of three coherent laser beams. By changing the voltage across a piezoelement, we obtain unprecedented directional steering, without relying on any mechanical alignment of optical elements. The angular range over which this maximum can be swept is determined by the intensity setting of one of the incident beams. Through simulations, we show that this method can also be applied to steer the radiation from a square hole in two independent directions. Our method can be applied to create a directional nanoemitter which can selectively address one or more detectors, or as an optical switch in photonic circuits.

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