AI Article Synopsis
- This study presents a new high-resolution spectral method utilizing Bloch-wave symmetry to analyze mode dispersion in periodic waveguides based on near-field profile measurements.
- The research successfully characterizes both propagating and evanescent modes, accurately measuring the amplitudes of waves traveling in both directions across various waveguide setups.
- Unlike traditional spatial Fourier-transform analysis, which is constrained by the waveguide's length, this method allows for precise dispersion extraction even in smaller photonic structures, achieving a measurement accuracy of several percent or better.
Article Abstract
We formulate and demonstrate experimentally the high-resolution spectral method based on Bloch-wave symmetry properties for extracting mode dispersion in periodic waveguides from measurements of near-field profiles. We characterize both the propagating and evanescent modes, and also determine the amplitudes of forward and backward waves in different waveguide configurations, with the estimated accuracy of several percent or less. Whereas the commonly employed spatial Fourier-transform (SFT) analysis provides the wavenumber resolution which is limited by the inverse length of the waveguide, we achieve precise dispersion extraction even for compact photonic structures.
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| http://dx.doi.org/10.1364/oe.17.003716 | DOI Listing |
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