Recent Approaches for Broadening the Spectral Bandwidth in Resonant Cavity Optoelectronic Devices

Figure 11

Schematic of (a) TM-polarized (Λ = 380 nm, = 130 nm, and = 235 nm) and (b) TE-polarized (Λ = 620 nm, = 400 nm, and = 140 nm) HCG. Red arrows show the light propagation directions. The black arrows show the E-field polarization directions. Calculated reflectivity spectra for surface-normal incident plane waves with E-field along the (blue) and (red) directions for (c) TM- and (d) TE-HCG. The TM-HCG has a very high reflectivity for E-field aligned in the direction but significantly lower reflectivity for the direction. The opposite is true for TE-HCG. This enables polarization selection in HCG-VCSELs [25].

(a)

(b)

(c)

(d)