Polarized light absorption in wurtzite InP nanowire ensembles

Marta De Luca, Attilio Zilli, H. Aruni Fonseka, Sudha Mokkapati, Antonio Miriametro, Hark Hoe Tan, Leigh Morris Smith, Chennupati Jagadish, Mario Capizzi, Antonio Polimeni

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31 Citations (Scopus)

Abstract

We investigate the absorption properties of ensembles of wurtzite (WZ) InP nanowires (NWs) by high-resolution polarization-resolved photoluminescence excitation (PLE) spectroscopy at T = 10 K. The degree of linear polarization of absorbed light, ρabs, resulting from the PLE spectra is governed by a competition between the dielectric mismatch effect and the WZ selection rules acting differently on different optical transitions. These two contributions are deconvoluted with the help of finite-difference time-domain simulations, thus providing information about the symmetry of the three highest valence bands (A, B, and C) of WZ InP and the extent of the spin-orbit interaction on these states. Moreover, ρabs shows two characteristic dips corresponding to the two sharp A and B exciton resonances in the PLE spectra. A model developed for the dip in A provides the first experimental evidence of an enhancement in the dielectric mismatch effect originating from the Coulomb interaction between electron and hole.

Original languageEnglish
Pages (from-to)998-1005
Number of pages8
JournalNano Letters
Volume15
Issue number2
DOIs
Publication statusPublished - 11 Feb 2015
Externally publishedYes

Keywords

  • dielectric mismatch
  • excitons
  • InP nanowires
  • photoluminescence excitation
  • wurtzite band structure

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