Photonic crystal devices and photonic crystal coupling defect waveguide
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机译：光子晶体器件和光子晶体耦合缺陷波导
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摘要
The coupling length when the waveguide in the photonic crystal is mode-coupled is shortened. The photonic crystal includes an element constituting a periodic structure, and suppresses propagation of an electromagnetic field including light or radio waves having a specific wavelength or frequency range. A coupled waveguide is a line defect in which a plurality of defects, which are parts where the above elements are locally removed, are connected as a line in a photonic crystal to form a waveguide, and an input / output terminal for inputting and outputting an electromagnetic field. Each of which is composed of at least two waveguides. By increasing the difference in propagation constant between the even mode and the odd mode at the normalized frequency, the coupling length of the mode-coupled propagation electromagnetic wave propagating in the coupled waveguide is shortened. For example, the medium and lattice constants of the photonic crystal and the size and shape of the above elements are changed to shift the band structure of the even and odd modes with respect to the normalized frequency, or the band structures of the even and odd modes are different. Change by degree.
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