Blue- and red-shifting amplified spontaneous emission of CdSe/CdS core/shell colloidal quantum dots

2013-01-01
Keleştemur, Yusuf
Guzelturk, Burak
Yerli, Ozan
Kurum, Ulas
YAĞLIOĞLU, HALİME GÜL
ELMALI, Ayhan
Demir, Hilmi Volkan
We report blue- and red-shifting amplified spontaneous emission of CdSe/CdS quantum dots, controlled by varying core/shell dimensions and modifying exciton-exciton interactions, with low optical gain threshold of two-photon absorption pumping.
Conference on Lasers and Electro-Optics (CLEO)

Suggestions

Quantitative analysis of nonlinear dynamics of quantum light transmission in strongly coupled quantum dot-cavity systems
Tugen, Alperen; Kocaman, Serdar (Elsevier BV, 2019-04-01)
We compared transmission spectra of coupled high-Q cavity with quantum dot (QD) systems in the strong coupling regime with Input-Output Formalism (IOF) and Incoherent Pumping Mechanism (IPM) based on Lindblad master equation approach. The peak transmission of Dipole Induced Transparency (DIT) together with its full-width-half-maximum (FWHM) are enquired for detailed analysis. Both methods exhibit the same vacuum Rabi splitting in on-resonant case, in contrast, the peak of DIT is estimated smaller between 50...
Intersubband resonant enhancement of the nonlinear optical properties in compositionally asymmetric and interdiffused quantum wells
Karabulut, İbrahim; Şafak, Haluk; Tomak, Mehmet (AIP Publishing, 2008-5-15)
We report the resonant enhancement of the second- and third-order optical nonlinearities in compositionally asymmetric quantum wells with finite confining potential and interdiffused quantum wells. The energy levels and the envelope wave functions in quantum wells are obtained by solving numerically the Schrodinger equation. The optical rectification, second and third harmonic generation coefficients are calculated within the framework of the density matrix formalism. The effect of the structure parameters ...
Engineering nonlinear response of nanomaterials using Fano resonances
Turkpence, Deniz; Akguc, Gursoy B.; Bek, Alpan; Taşgın, Mehmet Emre (IOP Publishing, 2014-10-01)
We show that nonlinear optical processes of nanoparticles can be controlled by the presence of interactions with a molecule or a quantum dot. By choosing the appropriate level spacing for the quantum emitter, one can either suppress or enhance the nonlinear frequency conversion. We reveal the underlying mechanism for this effect, which is already observed in recent experiments: (i) suppression occurs simply because transparency induced by Fano resonance does not allow an excitation at the converted frequenc...
Attractive versus Repulsive Excitonic Interactions of Colloidal Quantum Dots Control Blue- to Red-Shifting (and Non-shifting) Amplified Spontaneous Emission
Cihan, Ahmet Fatih; Keleştemur, Yusuf; Guzelturk, Burak; Yerli, Ozan; Kurum, Ulas; YAĞLIOĞLU, HALİME GÜL; ELMALI, Ayhan; Demir, Hilmi Volkan (2013-12-01)
Tunable, high-performance, two-photon absorption (TPA)-based amplified spontaneous emission (ASE) from near-unity quantum efficiency colloidal quantum dots (CQDs) is reported. Besides the absolute spectral tuning of ASE, the relative spectral tuning of ASE peak with respect to spontaneous emission was shown through engineering excitonic interactions in quasi-type-II CdSe/CdS core/shell CQDs. With core shell size adjustments, it was revealed that Coulombic exciton-exciton interactions can be tuned to be attr...
Optical absorption of a quantum well with an adjustable asymmetry
Yildirim, H.; Tomak, Mehmet (Springer Science and Business Media LLC, 2006-04-01)
The effects of asymmetry and the electric field on the electronic subbands and the nonlinear intersubband optical absorption of GaAs quantum wells represented by a Poschl-Teller confining potential are studied. The potential itself can be made asymmetric through a correct choice of its parameter set and this adjustable asymmetry is important for optimizing the absorption. In that way optimal cases can be created. We calculate the modified wave functions and electronic subbands variationally. The linear and ...
Citation Formats
Y. Keleştemur et al., “Blue- and red-shifting amplified spontaneous emission of CdSe/CdS core/shell colloidal quantum dots,” presented at the Conference on Lasers and Electro-Optics (CLEO), San-Jose, Kostarika, 2013, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92770.