One- and two-photon photoluminescence excitation spectra of CdTe quantum dots in a cryogenic confocal microscopy platform

Author(s)

Almeida, Diogo B. ^[1] ; de Thomaz, Andre A. ^[1] ; Carvalho, Hernandes F. ^[2] ; Cesar, Carlos L. ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Inst Fis Gleb Wataghin, Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Biol, Dept Cellular Biol, Campinas, SP - Brazil

• Document type: Journal article
• Source: Optics Express; v. 23, n. 15, p. 19715-19727, JUL 27 2015.
• Web of Science Citations: 1

Abstract

In this work we describe a method to obtain photoluminescente excitation spectra, through one and two photon absorption, of CdTe quantum dots, based on a confocal microscope platform. This system becomes an analytical multipurpose characterization platform with spatial, and spectral resolution with temperature control. The capabilities of such platform were demonstrated by photoluminescence and second harmonic generation spectra acquisition as a function of temperature from 10 K to room temperature. The differences for one and two photons transition selection rules between the quantum dot confined levels provide access to intra and inter band, forbidden in one photon transitions, information that could be used to validate confinement models. The results agree well with the transition selection rules calculated with a parabolic model. (C) 2015 Optical Society of America (AU)

• FAPESP's process: 05/51689-2 - Optics and Photonics Research Center at UNICAMP
• Grantee: Hugo Luis Fragnito
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 11/51959-0 - Biology of neoplastic diseases of bone marrow
• Grantee: Sara Teresinha Olalla Saad
• Support Opportunities: Research Projects - Thematic Grants