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Giant angular dispersion mediated by plasmonic modal competition.

Chao-Yi Tai1, Wen-Hsiang Yu, Sheng Hsiung Chang

  • 1Department of Optics and Photonics, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan. cytai@dop.ncu.edu.tw

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|December 18, 2010
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Summary
This summary is machine-generated.

We demonstrate tunable angular dispersion using coupled plasmonic waveguides. This technology could enable miniaturized spectrometers with enhanced performance.

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Area of Science:

  • Photonics and Nanophotonics
  • Plasmonics
  • Waveguide Optics

Background:

  • Plasmonic waveguides offer unique light manipulation capabilities.
  • Controlling surface wave propagation is crucial for optical device design.
  • Angular dispersion is a key parameter in spectroscopic applications.

Purpose of the Study:

  • To investigate modal competition mediated angular dispersion in heterogeneously coupled plasmonic waveguides.
  • To explore the manipulation of surface wave propagation regimes through wavelength tuning.
  • To demonstrate the potential for miniaturized spectrometer design.

Main Methods:

  • Fabrication and characterization of heterogeneously coupled plasmonic waveguides.
  • Experimental control of surface wave propagation by varying excitation wavelength.
  • Measurement of output beam steering angles and angular dispersion.

Main Results:

  • Achieved tunable angular dispersion by controlling coupling states (coupled, decoupled, cutoff).
  • Demonstrated output beam steering from +15° to -17° for wavelengths 695 nm to 675 nm.
  • Obtained a maximum angular dispersion of 2.1°/nm.

Conclusions:

  • Heterogeneously coupled plasmonic waveguides enable precise control over angular dispersion.
  • The demonstrated tunability offers a novel approach for spectrometer design.
  • This research paves the way for nano-size spectrometers with revolutionary form factors.