Capasso, FedericoAziz, MichaelWilliams, JamesCharnvanichborikarn, SupakitKim, TaegonTabbal, MalekBao, Jiming2009-07-102007Bao, Jiming, Malek Tabal, Taegon Kim, Supakit Charnvanichborikarn, James S. Williams, Michael J. Aziz, and Federico Capasso. 2007. Point defect engineered Si sub-bandgap light-emitting diode. Optics Express 17, no. 7: 1333-1340.1094-4087http://nrs.harvard.edu/urn-3:HUL.InstRepos:3163267We extensively study the propagation features of higher-order modes in a photonic crystal fiber (PCF). Our analysis is based on a full-vector modal technique specially adapted to accurately describe light propagation in PCF’s. Unlike conventional fibers, PCF’s exhibit a somewhat unusual mechanism for the generation of higher-order modes. Accordingly, PCF’s are characterized by the constancy of the number of modes below a wavelength threshold. An explicit verification of this property is given through a complete analysis of the dispersion relations of higher-order modes in terms of the structural parameters of this kind of fiber. The transverse irradiance distributions for some of these higher-order modes are also presented, showing an excellent agreement with recent experimental measurements. In the same way, the full-vector nature of our approach allows us to analyze the rich polarization structure of the PCF mode spectrum.en-USoptoelectronicssemiconductorslight-emitting diodes10.1364/JOSAA.17.001333