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Opt Express. 2008 Oct 13;16(21):16404-9.

Sub-diffraction negative and positive index modes in mid-infrared waveguides.

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  • 1Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.


We characterize a strongly anisotropic waveguide consisting of alternating 80 nm layers of n(+)-InGaAs and i-AlInAs on InP substrate. A strong increase in the transverse magnetic (TM) reflection at lambda = 8.4 microm corresponds to a characteristic low-order mode cutoff for the left-handed waveguide. The subsequent decrease of TM reflection at lambda = 11.5 microm represents the onset of right-handed no-cutoff light guiding. Good qualitative agreement is found when the experimental results are compared to finite element and transfer-matrix frequency domain simulations.

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