Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods

Subhabrata Ghosh, Anna M. Chizhik, Gaoling Yang, Narain Karedla, Ingo Gregor, Dan Oron, Shimon Weiss, Jörg Enderlein, Alexey I. Chizhik

Research output: Contribution to journalArticle

Abstract

The mechanisms of exciton generation and recombination in semiconductor nanocrystals are crucial to the understanding of their photophysics and for their application in nearly all fields. While many studies have been focused on type-I heterojunction nanocrystals, the photophysics of type-II nanorods, where the hole is located in the core and the electron is located in the shell of the nanorod, remain largely unexplored. In this work, by scanning single nanorods through the focal spot of radially and azimuthally polarized laser beams and by comparing the measured excitation patterns with a theoretical model, we determine the dimensionality of the excitation transition dipole of single type-II nanorods. Additionally, by recording defocused patterns of the emission of the same particles, we measure their emission transition dipoles. The combination of these techniques allows us to unambiguously deduce the dimensionality and orientation of both excitation and emission transition dipoles of single type-II semiconductor nanorods. The results show that in contrast to previously studied quantum emitters, the particles possess a 3D degenerate excitation and a fixed linear emission transition dipole.

Original languageEnglish
Pages (from-to)1695-1700
Number of pages6
JournalNano letters
Volume19
Issue number3
DOIs
Publication statusPublished - Mar 13 2019

Fingerprint

Nanorods
nanorods
Semiconductor materials
dipoles
excitation
Nanocrystals
nanocrystals
Excitons
Laser beams
Heterojunctions
heterojunctions
emitters
recording
excitons
laser beams
Scanning
scanning
Electrons
electrons

Keywords

  • cylindrical vector beams
  • higher order laser modes
  • nanorods
  • optical transition dipole
  • quantum dot
  • semiconductor nanocrystal

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Ghosh, S., Chizhik, A. M., Yang, G., Karedla, N., Gregor, I., Oron, D., ... Chizhik, A. I. (2019). Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods. Nano letters, 19(3), 1695-1700. https://doi.org/10.1021/acs.nanolett.8b04695

Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods. / Ghosh, Subhabrata; Chizhik, Anna M.; Yang, Gaoling; Karedla, Narain; Gregor, Ingo; Oron, Dan; Weiss, Shimon; Enderlein, Jörg; Chizhik, Alexey I.

In: Nano letters, Vol. 19, No. 3, 13.03.2019, p. 1695-1700.

Research output: Contribution to journalArticle

Ghosh, S, Chizhik, AM, Yang, G, Karedla, N, Gregor, I, Oron, D, Weiss, S, Enderlein, J & Chizhik, AI 2019, 'Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods', Nano letters, vol. 19, no. 3, pp. 1695-1700. https://doi.org/10.1021/acs.nanolett.8b04695
Ghosh, Subhabrata ; Chizhik, Anna M. ; Yang, Gaoling ; Karedla, Narain ; Gregor, Ingo ; Oron, Dan ; Weiss, Shimon ; Enderlein, Jörg ; Chizhik, Alexey I. / Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods. In: Nano letters. 2019 ; Vol. 19, No. 3. pp. 1695-1700.
@article{2fbcf422e4e2485f9f42eebe1e0575b4,
title = "Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods",
abstract = "The mechanisms of exciton generation and recombination in semiconductor nanocrystals are crucial to the understanding of their photophysics and for their application in nearly all fields. While many studies have been focused on type-I heterojunction nanocrystals, the photophysics of type-II nanorods, where the hole is located in the core and the electron is located in the shell of the nanorod, remain largely unexplored. In this work, by scanning single nanorods through the focal spot of radially and azimuthally polarized laser beams and by comparing the measured excitation patterns with a theoretical model, we determine the dimensionality of the excitation transition dipole of single type-II nanorods. Additionally, by recording defocused patterns of the emission of the same particles, we measure their emission transition dipoles. The combination of these techniques allows us to unambiguously deduce the dimensionality and orientation of both excitation and emission transition dipoles of single type-II semiconductor nanorods. The results show that in contrast to previously studied quantum emitters, the particles possess a 3D degenerate excitation and a fixed linear emission transition dipole.",
keywords = "cylindrical vector beams, higher order laser modes, nanorods, optical transition dipole, quantum dot, semiconductor nanocrystal",
author = "Subhabrata Ghosh and Chizhik, {Anna M.} and Gaoling Yang and Narain Karedla and Ingo Gregor and Dan Oron and Shimon Weiss and J{\"o}rg Enderlein and Chizhik, {Alexey I.}",
year = "2019",
month = "3",
day = "13",
doi = "10.1021/acs.nanolett.8b04695",
language = "English",
volume = "19",
pages = "1695--1700",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Excitation and Emission Transition Dipoles of Type-II Semiconductor Nanorods

AU - Ghosh, Subhabrata

AU - Chizhik, Anna M.

AU - Yang, Gaoling

AU - Karedla, Narain

AU - Gregor, Ingo

AU - Oron, Dan

AU - Weiss, Shimon

AU - Enderlein, Jörg

AU - Chizhik, Alexey I.

PY - 2019/3/13

Y1 - 2019/3/13

N2 - The mechanisms of exciton generation and recombination in semiconductor nanocrystals are crucial to the understanding of their photophysics and for their application in nearly all fields. While many studies have been focused on type-I heterojunction nanocrystals, the photophysics of type-II nanorods, where the hole is located in the core and the electron is located in the shell of the nanorod, remain largely unexplored. In this work, by scanning single nanorods through the focal spot of radially and azimuthally polarized laser beams and by comparing the measured excitation patterns with a theoretical model, we determine the dimensionality of the excitation transition dipole of single type-II nanorods. Additionally, by recording defocused patterns of the emission of the same particles, we measure their emission transition dipoles. The combination of these techniques allows us to unambiguously deduce the dimensionality and orientation of both excitation and emission transition dipoles of single type-II semiconductor nanorods. The results show that in contrast to previously studied quantum emitters, the particles possess a 3D degenerate excitation and a fixed linear emission transition dipole.

AB - The mechanisms of exciton generation and recombination in semiconductor nanocrystals are crucial to the understanding of their photophysics and for their application in nearly all fields. While many studies have been focused on type-I heterojunction nanocrystals, the photophysics of type-II nanorods, where the hole is located in the core and the electron is located in the shell of the nanorod, remain largely unexplored. In this work, by scanning single nanorods through the focal spot of radially and azimuthally polarized laser beams and by comparing the measured excitation patterns with a theoretical model, we determine the dimensionality of the excitation transition dipole of single type-II nanorods. Additionally, by recording defocused patterns of the emission of the same particles, we measure their emission transition dipoles. The combination of these techniques allows us to unambiguously deduce the dimensionality and orientation of both excitation and emission transition dipoles of single type-II semiconductor nanorods. The results show that in contrast to previously studied quantum emitters, the particles possess a 3D degenerate excitation and a fixed linear emission transition dipole.

KW - cylindrical vector beams

KW - higher order laser modes

KW - nanorods

KW - optical transition dipole

KW - quantum dot

KW - semiconductor nanocrystal

UR - http://www.scopus.com/inward/record.url?scp=85062857071&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062857071&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.8b04695

DO - 10.1021/acs.nanolett.8b04695

M3 - Article

C2 - 30721068

AN - SCOPUS:85062857071

VL - 19

SP - 1695

EP - 1700

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 3

ER -