Sub-diffraction negative and positive index modes in mid-infrared waveguides.
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.
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA. ajhoffma@princeton.edu
Anthony J
AJ
Hoffman
Viktor A
VA
Podolskiy
Deborah L
DL
Sivco
Claire
C
Gmachl
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D008027:Light; D008962:Models, Theoretical; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation