Abstract
We study the eigenmodes of optical Tamm states (OTSs) at metal-distributed
Bragg reflector interface. A peculiar type of non-propagating OTSs, named
as evanescent OTSs, is found with mode propagation constant exhibiting the
imaginary part to be much larger than the real part. The existence of such
evanescent OTSs is attributed to the extension of Bragg forbidden band under
complex propagation constants. An analytical solution of the evanescent OTSs
is derived. Compared with propagating OTSs, transverse magnetic-polarized
evanescent OTSs are found to exhibit more strongly localized field distributions
associated with enhanced surface field intensity, which may be beneficial
for surface-related applications such as sensing. Potential application as
modulators is also demonstrated by using the nearly vertical dispersion characteristics
around the transition wavelength between propagating OTSs and evanescent OTSs.
© 2013 IEEE
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