Polarization spectroscopy of single CdSe quantum rods

Chen, X.; Nazzal, Amjad; Goorskey, David; Xiao, Min; Peng, Zhé; Peng, Xiaogang

doi:10.1103/physrevb.64.245304

Cited by 114 publications

(113 citation statements)

References 19 publications

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“…Although a spectral diffusion has been observed in singlenanoparticle and single-molecule systems [15,16], such a wide jump in the emission wavelength has not been reported. For example, several studies reveal that the emission bandwidth of single QDs is within 30 meV (6 nm at 500 nm) at cryogenic [12] and 60 meV at room temperature [17], and that the spectral diffusion is in the range of 10 meV [18]. The spectral variation of 220 meV which we observed is far too large to be account for by thermal effects.…”

Section: Resultscontrasting

confidence: 40%

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Yamasaki¹,

Asami

Isoshima

et al. 2003

Science and Technology of Advanced Materials

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A single chromophore detection using video-microscopy is one of the latest methodologies to reveal unique characteristics, which could not be obtained from ensemble measurements. Among many kinds of subjects, dynamic optical properties observed in colloidal semiconductor nanoparticles are attractive and important not only for the basis of photo-physics but also for application studies, e.g. biological labeling, electronic devices. In this study, fluorescence video-microscopy was performed on cadmium selenide (CdSe) quantum dots (QDs) spin-coated on a glass substrate. From single CdSe QDs detection, emissions at wavelengths separated over 60 nm were observed for the first time. This spectral feature was attributed to the existence of double-emissive relaxation processes in CdSe QDs. Photoluminescence intermittency was also observed both from relaxation processes. Fluorescence video-microscopy, which was advanced in biology, can be applicable for the real-time monitoring of dynamic properties in semiconductor photo-physics. q

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Section: Resultscontrasting

confidence: 40%

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Yamasaki¹,

Asami

Isoshima

et al. 2003

Science and Technology of Advanced Materials

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“…In particular, recent developments in synthesis methodologies, fully compatible with standard nanofabrication technologies have enabled a superior 3 control on nanocrystals composition and morphology.Rod-shaped nanocrystals showing pronounced polarization, behaving as emitting linear dipoles, have been obtained. [2][3][4] The encapsulation of a spherical core into a rod-like shell [5] resulted in non-blinking inorganic single photon emitters, [6] hereafter referred to as dot-in-rods (DRs). Moreover it has been recently shown that, by increasing the thickness of the shell, it is possible to greatly suppress photoluminescence blinking and to improve DRs overall photo-stability, while keeping a low probability of multi-photon emission.…”

mentioning

confidence: 99%

Alignment of Rod‐Shaped Single‐Photon Emitters Driven by Line Defects in Liquid Crystals

Pelliser

Manceau

Lethiec

et al. 2015

Adv Funct Materials

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We use arrays of liquid crystal defects, linear smectic dislocations, to trap semi-conductor CdSe/CdS dot-in-rods which behave as single photon emitters. We combine measurements of the emission diagram together with measurements of the emitted polarization of the single emitters. We show that the dot-inrods are confined parallel to the linear defects to allow for a minimization of the disorder energy associated with the dislocation cores. We demonstrate that the electric dipoles associated with the dotin-rods, tilted with respect to the rods, remain oriented in the plane including the smectic linear defects and being perpendicular to the substrate, most likely due to the dipole/dipole interactions between the dipoles of the liquid crystal molecules and the dot-in-rods ones. Using smectic dislocations, we can consequently orient nanorods along a unique direction for a given substrate, independently of the ligands' nature, without any induced aggregation, leading as well to a fixed azimuthal orientation for the associated dot-in-rods' dipoles. These results open the way for a fine control of nanoparticle anisotropic optical properties, in particular a fine control of single photon emission polarization.Control of single photon emitters is a major objective in the field of nanophotonics.[1] The synthesis of colloidal semiconductor inorganic nanocrystals having specific light-emission properties has been providing important advances in this field. In particular, recent developments in synthesis methodologies, fully compatible with standard nanofabrication technologies have enabled a superior 3 control on nanocrystals composition and morphology.Rod-shaped nanocrystals showing pronounced polarization, behaving as emitting linear dipoles, have been obtained. [2][3][4] The encapsulation of a spherical core into a rod-like shell [5] resulted in non-blinking inorganic single photon emitters, [6] hereafter referred to as dot-in-rods (DRs). Moreover it has been recently shown that, by increasing the thickness of the shell, it is possible to greatly suppress photoluminescence blinking and to improve DRs overall photo-stability, while keeping a low probability of multi-photon emission. [7] Such features are of primary importance when nanocrystalsare used in applications demanding a control of photons'polarization, such as coupling with complex photonic cavities [8][9] or quantum cryptography.[10] The control of the polarization of the emitted light also requires the capacity to control the particle orientation. Howevertechnologies aimed at guiding nanocrystal orientation at the single particle level are still poorly discussed in literature.Alignednanoparticleshave been obtained through mechanical rubbing, [11] short-range interactions [12][13] or patterned substrates. [14] Liquid crystal-like structures, composed of alarge number of elongated nanocrystalsassembled in multi-layers have also been evidenced on both solid substrates [15][16][17][18] and water films. [18][19][20] Orientation and positional ordering of CdS and CdSe...

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“…In both cases, polarized emission can be observed, with the degree of polarization depending of their orientation (with polarization degree higher for 1D dipoles). Analyses using polarimetric methods, sometimes combined with defocused imaging or decay curves, have demonstrated 2D-dipole behavior for spherical core-shell quantum dots [1][2][3][4] and dot-in-plate structures [5], and 1D-dipole behavior for nanorods [6] and dot-in-rods [7], with intermediate 1D+2D behavior for some structures [8,9]. These studies have found dipolar nature (1D or 2D) to be related both to the symmetry and degeneracy of the electron-hole transition dipole, and also to the shape of the nano-object, even when the Bohr radius of the exciton is smaller than the size of the nanoobject, a size difference that should made the dipolar transition insensitive to spatial confinement.…”

Section: Introductionmentioning

confidence: 99%

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

et al. 2018

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In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles involved in the nanoplatelet emission. It is shown that for rectangular nanoplatelets, the emission is polarized and the emission patterns are anisotropic, whereas they remain nonpolarized and isotropic for square nanoplatelets. This can be appropriately described by the dielectric antenna effect induced by the elongated shape of the rectangular platelet.

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Polarization spectroscopy of single CdSe quantum rods

Cited by 114 publications

References 19 publications

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Alignment of Rod‐Shaped Single‐Photon Emitters Driven by Line Defects in Liquid Crystals

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

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