Nonlocal optical response of weakly confined excitons in Cu2 O mesoscopic films

Mitsuyoshi Takahata, Koichiro Tanaka, Nobuko Naka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have demonstrated size-dependent radiative coupling in a Cu2O mesoscopic film, where the spatial matching between the center-of-mass exciton motion and light waves plays an essential role. The observed quadratic increase and oscillation of the photoluminescence intensity with varying film thicknesses (16-1000 nm) indicate a nonlocal response that is unique to mesoscopic systems. Optimally, a 104-fold enhanced radiative rate was found compared with bulk Cu2O. A new degree of freedom in the light-matter interaction is presented, which differs from the mode volume control in cavity quantum electrodynamics.

Original languageEnglish
Article number205305
JournalPhysical Review B
Volume97
Issue number20
DOIs
Publication statusPublished - 2018 May 24
Externally publishedYes

Fingerprint

Excitons
excitons
Electrodynamics
quantum electrodynamics
center of mass
Film thickness
Photoluminescence
film thickness
degrees of freedom
photoluminescence
oscillations
cavities
interactions
LDS 751

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Nonlocal optical response of weakly confined excitons in Cu2 O mesoscopic films. / Takahata, Mitsuyoshi; Tanaka, Koichiro; Naka, Nobuko.

In: Physical Review B, Vol. 97, No. 20, 205305, 24.05.2018.

Research output: Contribution to journalArticle

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