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Transmission electron micrographs of ultrathin sections of porous alumina (pore diameter: ; pore depth: ) wetted with a mixture HgTe/PS. (a) Overview (on the left: bottoms of the template pores). (b) high-resolution image of a QD cluster within a tube wall (the dark strip from the top left to the bottom right is a pore wall consisting of alumina). Inset: individual QD within a tube wall.
Measurements: (a) free space PL spectrum of HgTe/PS tubes; (b) PL spectra of HgTe QDs in a hexagonal 2D photonic crystal of macroporous silicon (lattice constant , TE polarization, ), normalized to the free space emission spectrum, compared to the corresponding reflection measurement; (c) same as (b) for TM polarization.
Numerical calculation: (a) band structure of the 2D photonic crystal . Light gray corresponds to TE polarization and dark gray to TM polarization. The dashed lines are bands that cannot couple to plane waves due to symmetry reasons. (b), (c) Emission spectra of a source placed in the middle of a photonic crystals along (power flow normalized to power flow without photonic crystals). (b) TE-polarized emission spectra for different acceptance angles. Only a slight change of the band edge is observed changing the angle. (c) TM-polarized emission spectra for different acceptance angles. A strong dependence of the band edge is observed with the increasing angle.
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