Optical line broadening mechanisms in rare-earth doped oxide nanocrystals

Fossati，A.1; Serrano，D.1; Liu，S.1,2; Tallaire，A.1; Ferrier，A.1,3; Goldner，P.1

2023-11-01

10.1016/j.jlumin.2023.120050

Journal of Luminescence   Impact Factor & Quartile

0022-2313

1872-7883

Rare-earth ions in nanocrystals are promising solid-state platforms for quantum light-matter interfaces, combining millisecond-long nuclear spin T with kHz-range optical homogeneous linewidths. Coupled to optical micro-cavities these materials can enable scalable quantum processors, nanoscale quantum memories and single photon sources. Here, we report on optical dephasing in Eu:YO nanocrystals of 100 nm diameter through photon echo and spectral hole burning techniques as a function of temperature and magnetic field. We identify two-level systems (TLS) and electric noise as major line broadening mechanisms below 2 K and demonstrate that material-processing strategies such as high-power oxygen plasma can partially counteract these effects. Through modeling we show that these results are compatible with a reduction in the number of oxygen vacancy pairs in the nanocrystals by the oxygen plasma processing. These pairs, even at very low concentrations (hundreds of ppb), appear detrimental to optical coherence due to their ability to generate fluctuating electric fields.

Nanoparticles Optical homogeneous linewidth Quantum technologies Rare-earth

SCI

English

Others

Basic and Applied Basic Research Foundation of Guangdong Province[2021A1515110191];European Commission[712721];European Commission[820391];Agence Nationale de la Recherche[ANR-20-CE09-0022-01];

Optics

Optics

WOS:001045863600001

ELSEVIER

PHYSICS

2-s2.0-85165954265

Scopus

1.Chimie ParisTech,PSL University,CNRS,Institut de Recherche de Chimie Paris,Paris,F-75005,France
2.Shenzhen Institute for Quantum Science and Engineering,Department of Physics,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Avenue,518055,China
3.Sorbonne Universite,Faculte des Sciences et Ingenierie,Paris,UFR 933,F-75005,France

Fossati，A.,Serrano，D.,Liu，S.,et al. Optical line broadening mechanisms in rare-earth doped oxide nanocrystals[J]. Journal of Luminescence,2023,263.

Fossati，A.,Serrano，D.,Liu，S.,Tallaire，A.,Ferrier，A.,&Goldner，P..(2023).Optical line broadening mechanisms in rare-earth doped oxide nanocrystals.Journal of Luminescence,263.

Fossati，A.,et al."Optical line broadening mechanisms in rare-earth doped oxide nanocrystals".Journal of Luminescence 263(2023).