Dielectric theory of interacting excitonic resonances

Lagois, J.

doi:10.1103/physrevb.16.1699

Cited by 70 publications

(33 citation statements)

References 13 publications

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“…The nanowire crystal dimensions are such however, that the aforementioned super radiance and giant oscillator strength effects can be significant, and in the model they are incorporated by the longitudinal-transverse splitting ͑ AL 2 − AT 2 ͒ which is proportional to the oscillator strength of the excitonic transition. 17 To verify our calculations experimentally, CdS nanowires where excited nonresonantly across the band gap at one end whereas the waveguided photoluminescence was collected at the other end of the wire. The collected spectra ͑Fig.…”

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confidence: 99%

Incorporating polaritonic effects in semiconductor nanowire waveguide dispersion

Vugt

Piccione

Agarwal

2010

Applied Physics Letters

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We present the calculated and measured energy-propagation constant (E-β) dispersion of CdS nanowire waveguides at room temperature, where we include dispersive effects via the exciton-polariton model using physical parameters instead of a phenomenological equation. The experimental data match well with our model while the phenomenological equation fails to capture effects originating due to light-matter interaction in nanoscale cavities. Due to the excitonic-polaritonic effects, the group index of the guided light peaks close to the band edge, which can have important implications for optical switching and sensor applications.

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confidence: 99%

Incorporating polaritonic effects in semiconductor nanowire waveguide dispersion

Vugt

Piccione

Agarwal

2010

Applied Physics Letters

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“…The values of these frequencies at k ¼ 0 yield the so-called longitudinal frequencies (also called the longitudinal resonance frequencies in Ref. 17) of the two longitudinal polariton bands, x AL and x BL , respectively. The difference between these longitudinal frequencies and the transverse excitonic resonance frequencies mentioned above are related to the polarizabilities of the exciton resonances and these longitudinal-transverse (LT) splittings are normally used as the variable to express the degree of exciton-photon coupling for each resonance and are the quantities we use when reporting and discussing results below.…”

Section: Reflectance Modelingmentioning

confidence: 99%

“…The difference between these longitudinal frequencies and the transverse excitonic resonance frequencies mentioned above are related to the polarizabilities of the exciton resonances and these longitudinal-transverse (LT) splittings are normally used as the variable to express the degree of exciton-photon coupling for each resonance and are the quantities we use when reporting and discussing results below. The two are related via an argument which ultimately leads to a modified Lyddane-Sachs-Teller relation 17 and the necessary relations to convert between the two are as follows:…”

Section: Reflectance Modelingmentioning

confidence: 99%

Study of exciton-polariton modes in nanocrystalline thin films of CuCl using reflectance spectroscopy

Foy

McGlynn

Cowley

et al. 2012

Journal of Applied Physics

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Photoluminescence study of magnetic spin clusters and their temperature evolution in Cd0.70Mn0.30Te spinglass compound J. Appl. Phys. 112, 093715 (2012) Excitonic luminescence in two-dimensionally confined layered sulfide oxides Appl. Phys. Lett. 101, 191901 (2012) Excitons imaging in hybrid organic-inorganic films J. Appl. Phys. 112, 093105 (2012) Bound and anti-bound biexciton in site-controlled pyramidal GaInAs/GaAs quantum dots Appl. Phys. Lett. 101, 191101 (2012) Vanadium bound exciton luminescence in 6H-SiC Appl. Phys. Lett. 101, 151903 (2012) Additional information on J. Appl. Phys. CuCl thin films grown on (100) Si by thermal evaporation are studied using reflectance spectroscopy. The reflectance spectra in the near UV spectral range close to the CuCl bandgap are modeled using a dielectric response function based on an exciton-polariton response with various models involving dead layers and reflected waves in the thin film. The exciton-polariton structure obtained is compared to other studies of bulk CuCl crystals. These different models are analyzed using a matrix-based approach and they yield theoretical spectra of reflected intensity. The fits provide parameter values which can be compared to bulk data known for CuCl and provide a nondestructive means of quantitative analysis of CuCl thin films. The best models are shown to match the experimental data quite well, with the closest fits produced when thin film front and rear interfaces are included. This model also accurately simulates the Fabry-Perot fringes present at energies lower than the Z 3 free exciton position in CuCl (at 3.272 eV). V C 2012 American Institute of Physics. [http://dx

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“…The exciton-polariton dispersion and reflectivity spectra have been calculated considering the multicomponent excitons and utilizing the additional boundary condition methods 24,25,27 . However, thus far, they have not been discussed from the view point of a ratio of each excitonic component.…”

Section: Semi-infinite Systemmentioning

confidence: 99%

“…The dispersion relation of this state in ZnO can be obtained by applying the Pekar's theory 22 to the multiple resonances of excitons. [23][24][25] . Thus, respective peak structures of optical spectra generally contain contributions from the multiple components of excitons.…”

Section: Introductionmentioning

confidence: 99%

Radiative coupling of A and B excitons in ZnO

Kinoshita

Ishihara

2016

Phys. Rev. B

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Radiation-induced coupling between A and B excitons in ZnO is theoretically studied. Considering the center-of-mass motion of excitons in bulk and thin film structures, we calculate the eigenmodes of an exciton-radiation coupled system and reveal the ratio of each excitonic component in the respective eigenmodes, which is determined from diagonalization of the self-consistent equation between the polarization and the Maxwell electric field. In particular, in a nano-to-bulk crossover size regime, the large interaction volume between multipole-type excitonic waves and radiation waves causes radiative coupling between excitons from different valence bands, which leads to an enhancement of the radiative correction. The results presented in this study are in striking contrast with the conventional view of the optical response of excitons in ZnO, where A and B excitons are independently assigned to their respective spectral structures. We demonstrate an alternative spectral assignment of nonlinear optical signals by focusing on the degenerate four-wave mixing.

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Dielectric theory of interacting excitonic resonances

Cited by 70 publications

References 13 publications

Incorporating polaritonic effects in semiconductor nanowire waveguide dispersion

Incorporating polaritonic effects in semiconductor nanowire waveguide dispersion

Study of exciton-polariton modes in nanocrystalline thin films of CuCl using reflectance spectroscopy

Radiative coupling of A and B excitons in ZnO

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