Abstract
The dispersion properties of waveguides with negative dielectric cladding are investigated. It is found that ${\mathrm{TM}}_{1}$ modes can exist even in waveguides with the thickness of the guiding layer 10 times smaller than the wavelength; i.e., the guiding layers can be in nanometer scale. The bandpassing, frequency-response, and transmission loss properties are analyzed. The waveguides may find application in integrated optical devices, optical lithography, subwavelength optical imaging, and nonlinear optics on the merit of high-energy density in an ultrathin region.
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