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

doi:10.1021/nl5038374

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^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

41 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, φ_abs, 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, φ_abs 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 language	English
Pages (from-to)	998-1005
Number of pages	8
Journal	Nano Letters
Volume	15
Issue number	2
DOIs	https://doi.org/10.1021/nl5038374
Publication status	Published - 11 Feb 2015

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title = "Polarized light absorption in wurtzite InP nanowire ensembles",

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, φabs, 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, φabs 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.",

keywords = "InP nanowires, dielectric mismatch, excitons, photoluminescence excitation, wurtzite band structure",

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

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = feb,

day = "11",

doi = "10.1021/nl5038374",

language = "English",

volume = "15",

pages = "998--1005",

journal = "Nano Letters",

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T1 - Polarized light absorption in wurtzite InP nanowire ensembles

AU - De Luca, Marta

AU - Zilli, Attilio

AU - Fonseka, H. Aruni

AU - Mokkapati, Sudha

AU - Miriametro, Antonio

AU - Tan, Hark Hoe

AU - Smith, Leigh Morris

AU - Jagadish, Chennupati

AU - Capizzi, Mario

AU - Polimeni, Antonio

PY - 2015/2/11

Y1 - 2015/2/11

N2 - 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, φabs, 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, φabs 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.

AB - 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, φabs, 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, φabs 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.

KW - InP nanowires

KW - dielectric mismatch

KW - excitons

KW - photoluminescence excitation

KW - wurtzite band structure

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U2 - 10.1021/nl5038374

DO - 10.1021/nl5038374

M3 - Article

SN - 1530-6984

VL - 15

SP - 998

EP - 1005

JO - Nano Letters

JF - Nano Letters

IS - 2

ER -

Polarized light absorption in wurtzite InP nanowire ensembles

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