Article
Chemistry, Physical
Lifeng Wang, Dongmei Xiang, Kaimin Gao, Junhui Wang, Kaifeng Wu
Summary: Colloidal n-doped CdSe and CdSe/ZnS nanoplatelets have been achieved through a photochemical doping method, demonstrating successful additional electron doping at the conduction band edge. The key to successful doping lies in a high surface ligand coverage, while unpassivated surface cations may lead to depletion of the doped electrons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Maxim Rakhlin, Sergey Sorokin, Dmitrii Kazanov, Irina Sedova, Tatiana Shubina, Sergey Ivanov, Vladimir Mikhailovskii, Alexey Toropov
Summary: This study introduces single photon emitters for the green-yellow spectral range, utilizing a CdSe/ZnSe quantum dot inside a semiconductor tapered nanocolumn acting as a nanoantenna. Despite the presence of multiple optical modes, the nanoantenna efficiently collects and outputs the quantum dot radiation. Arrays of such emitters, fabricated using focused ion beam etching from a II-VI/III-V heterostructure grown via molecular beam epitaxy, demonstrate promising potential for secure free space optical communication lines with an average count rate exceeding 5 MHz and a low second-order correlation function at 220 K.
Article
Chemistry, Multidisciplinary
Elena Shornikova, Dmitri R. Yakovlev, Nikolay A. Gippius, Gang Qiang, Benoit Dubertret, Ali Hossain Khan, Alessio Di Giacomo, Iwan Moreels, Manfred Bayer
Summary: Colloidal semiconductor nanoplatelets exhibit strong quantum confinement for electrons and holes in one dimension, with significant increase in Coulomb interaction. The exciton binding energies are evaluated to be much higher compared to bulk CdSe, and comparable to monolayer-thick transition metal dichalcogenides.
Article
Chemistry, Physical
Micaih J. Murray, Matthew M. Jones, Dean R. Peterman, Sharon L. Neal
Summary: The impact of 60Co gamma irradiation on the photoluminescent properties of CdSe/ZnS semiconductor quantum dots in toluene was investigated. The emission of the quantum dots consisted of three components that changed with increasing gamma ray exposure. QD degradation was accelerated in samples with appreciable headspace, and the formation of larger particles was observed. Dynamic light scattering measurements corroborated these findings.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shaojie Liu, Yufei Shu, Meiyi Zhu, Haiyan Qin, Xiaogang Peng
Summary: Most bulk semiconductors show an increase in band-gap energy with decreasing temperature. However, semiconductor quantum dots (QDs) exhibit non-monotonic temperature dependence of the emission energy at low temperatures. This study uses stable and efficient CdSe/CdS/ZnS QDs as a model system to quantitatively explain the origins of the anomalous emission red-shift at temperatures below 40 K. The red-shift is attributed to the temperature-dependent population of band-edge exciton fine levels, enhanced electron-optical phonon coupling due to increasing population of dark excitons, and temperature-dependent electron-acoustic phonon coupling.
Article
Engineering, Electrical & Electronic
Miao Sun, Shuangshuang Zhang, Jiajia Wang, Zhenhong Jia, Xiaoyi Lv, Xiaohui Huang
Summary: The angle spectrum method was used to further improve the sensitivity of porous silicon-assembled microcavity biosensors, successfully detecting different concentrations of target DNA with a detection limit of 13.25 pM. This method offers advantages such as being spectrometer free and cost-effective.
IEEE PHOTONICS JOURNAL
(2021)
Article
Chemistry, Physical
Zhengjun Wang, Albin Hedse, Edoardo Amarotti, Nils Lenngren, Karel Zidek, Kaibo Zheng, Donatas Zigmantas, Tonu Pullerits
Summary: Advances in ultrafast spectroscopy have allowed us to study the dynamics of nontrivial quantum correlations. In this study, we used coherent 2D spectroscopy to analyze the beating signals in CdSe quantum dots at low temperature. The beating signals were found to originate from coherent LO-phonons of CdSe quantum dots, independent of the size of the dots.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Zhengjun Wang, Albin Hedse, Edoardo Amarotti, Nils Lenngren, Karel Zidek, Kaibo Zheng, Donatas Zigmantas, Tonu Pullerits
Summary: Advancements in ultrafast spectroscopy provide insights into the nontrivial quantum dynamics of CdSe quantum dots. Analysis of positive and negative Fourier components in electronic coherent 2D spectroscopy confirms that the oscillatory signals stem from coherent LO-phonons in CdSe QDs, with no observed dependence on QD size. Published with exclusive license by AIP Publishing.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Xuefeng Peng, Zhijian Wu, Chen Ye, Yang Ding, Wei Liu
Summary: The emission features of Cdse/ZnS quantum dots doped step-index polymer optical fibers are computationally analyzed in this paper. Spontaneous emission and amplified spontaneous emission were calculated based on a theoretical model, and the calculated parameters were derived from experiments. Through comparative analysis, it was found that the pump power and overlap between emission and absorption cross-sections are the main reasons for the red shift of output spectra. The output spectra will rapidly decrease in width and fall back toward the maximum emission cross-section when the pump power exceeds the threshold of amplified spontaneous emission. The final output wavelength is still affected by doping concentration and pump power, while amplified spontaneous emission is not generated when the total number of doped quantum dots is less than 1.27 x 10(12).
Article
Radiology, Nuclear Medicine & Medical Imaging
Emil Y. Sidky, Emily R. Paul, Taly Gilat-Schmidt, Xiaochuan Pan
Summary: This study proposes a method for spectral sensitivity calibration of a PCD-based spectral CT system that incorporates nonlinear flux dependence and can be used at high photon flux levels. The method accurately accounts for the nonlinear intensity dependence and enables accurate physical modeling necessary for quantitative imaging in spectral CT.
Article
Nanoscience & Nanotechnology
Tiziana Ritacco, Giuseppe Emanuele Lio, Xiaolun Xu, Aurelie Broussier, Ali Issa, Michele Giocondo, Renaud Bachelot, Sylvain Blaize, Christophe Couteau, Safi Jradi
Summary: Three-dimensional photoluminescent crypto-images can be created using quantum dots within polymeric micro-objects. By utilizing two-photon polymerization direct laser writing, majority of QDs are expelled from the irradiated area due to monomer cross-linking. Physical phenomena of QDs excitation and surrounding thermal polymerization can be combined to control local density of QDs with nanometric resolution and tune local photoemission.
ACS APPLIED NANO MATERIALS
(2021)
Article
Engineering, Marine
Soonmi Hwang, Ki-Su Kwak, Jung Lyul Lee
Summary: In this study, frequency spectra were obtained using the ZUCT and FFT methods from waveform data observed at a macro-tidal beach. The conversion characteristics of the spectra with respect to changes in water depth were investigated and compared with the TMA spectrum applicable to shallow water. The study also proposed the TMA-SOON equation for estimating wave energy and spectrum in the nearshore zone.
Article
Chemistry, Multidisciplinary
Maryam Moradi, Isabelle Staude, Thomas Pertsch, Michael Jaeger, Ulrich S. Schubert
Summary: In this contribution, the researchers investigated the control of plasmon-nanoemitter interactions at the nanoscale and achieved reversible pH-responsive photoluminescence switching in CdSe/ZnS Quantum Dots (QDs) nanoemitters. They utilized a pH responsive spacer layer to modulate the distance between the QDs and the gold surface, resulting in significant enhancement of QDs' photoluminescence intensity through changing the pH value. The developed system demonstrated stability, reversibility, and reproducibility in photoluminescence enhancement.
Article
Materials Science, Multidisciplinary
Kai Zuo, Haidong Shi, Xudong Yan, Jianxun Liu, Yan-Jun Liu, Dan Luo, Yue Shi
Summary: This paper demonstrates the realization of circularly polarized luminescence with high dissymmetry factor by introducing fluorescent materials into intrinsic chiral nematic mesostructures of cellulose nanocrystals. By doping CdSe/ZnS quantum dots, full-color and white right-handed circularly polarized luminescent films are achieved, offering easy and powerful platforms for potential applications in narrowband and broadband chiral optics.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Analytical
Timofey Shevgunov, Evgeny Efimov, Oksana Guschina
Summary: This article focuses on estimating the spectral correlation function (SCF) in order to quantitatively characterize the cyclostationary properties of random processes in the frequency domain. The proposed double-number fast Fourier transform algorithm (2N-FFT) is outlined as a digital signal processing technique, which ensures accurate estimation of cyclic frequencies without leaving any frequency out of the coverage grid. Numerical simulations demonstrate the high accuracy of the algorithm and its similarity to the theoretical models of observed processes. A comparison with the FFT accumulation method reveals the computational complexity trade-offs offered by the 2N-FFT algorithm.
Article
Chemistry, Multidisciplinary
Laurent Pelliser, Mathieu Manceau, Clotilde Lethiec, Delphine Coursault, Stefano Vezzoli, Godefroy Lemenager, Laurent Coolen, Massimo DeVittorio, Ferruccio Pisanello, Luigi Carbone, Agnes Maitre, Alberto Bramati, Emmanuelle Lacaze
ADVANCED FUNCTIONAL MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
S. Gam-Derrouich, C. Bourdillon, W. Daney De Marcillac, L. Coolen, A. Maitre, C. Mangeney, C. Schwob
CHEMICAL COMMUNICATIONS
(2015)
Article
Engineering, Electrical & Electronic
F. Feng, K. Ouaret, S. Portalupi, X. Lafosse, M. Nasilovski, W. Daney de Marcillac, J. -M. Frigerio, C. Schwob, B. Dubertret, A. Maitre, P. Senellart, L. Coolen
JOURNAL OF ELECTRONIC MATERIALS
(2016)
Article
Materials Science, Multidisciplinary
L. Biadala, H. Frederich, L. Coolen, S. Buil, X. Quelin, C. Javaux, M. Nasilowski, B. Dubertret, J. -P. Hermier
Article
Engineering, Electrical & Electronic
Amit Raj Dhawan, Fu Feng, Laurent Coolen, Agnes Maitre
IEEE PHOTONICS JOURNAL
(2015)
Article
Materials Science, Multidisciplinary
Bourdillon Celine, Hong Phan Ngoc, Daney de Marcillac Willy, Coolen Laurent, Maitre Agnes, Schwob Catherine
JOURNAL OF MATERIALS CHEMISTRY C
(2015)
Article
Chemistry, Physical
Clotilde Lethiec, Guillaume Binard, Trajan Popescu, Hugo Frederich, Hong Phan Ngoc, Eduardo Yraola, Catherine Schwob, Fabrice Charra, Laurent Coolen, Ludovic Douillard, Agnes Maitre
JOURNAL OF PHYSICAL CHEMISTRY C
(2016)
Article
Physics, Multidisciplinary
Fu Feng, Willy Daney de Marcillac, Xavier Lafosse, Simone Luca Portalupi, Michel Nasilowski, Benoit Dubertret, Jean-Marc Frigerio, Catherine Schwob, Agnes Maitre, Pascale Senellart, Laurent Coolen
NEW JOURNAL OF PHYSICS
(2016)
Article
Chemistry, Physical
Fu Feng, Loan Thu Nguyen, Michel Nasilowski, Brice Nadal, BenoIt Dubertret, Laurent Coolen, Agnes Maitre
Article
Chemistry, Multidisciplinary
Le Xuan Hung, Pascal D. Bassene, Pham Nam Thang, Nguyen Thu Loan, Willy Daney de Marcillac, Amit Raj Dhawan, Fu Feng, Juan U. Esparza-Villa, Nguyen Thi Thuc Hien, Nguyen Quang Liem, Laurent Coolen, Pham Thu Nga
Article
Physics, Multidisciplinary
Fu Feng, Clementine Symonds, Catherine Schwob, Joel Bellessa, Agnes Maitre, Jean-Paul Hugonin, Laurent Coolen
NEW JOURNAL OF PHYSICS
(2018)
Article
Nanoscience & Nanotechnology
Fu Feng, Loan Thu NGuyen, Michel Nasilowsk, Brice Nadal, Benoit Dubertre, Agnes Maitre, Laurent Coolen
Article
Nanoscience & Nanotechnology
Maria Ulfa, Pengjiu Wang, Jie Zhang, Jiawen Liu, Willy Daney de Marcillac, Laurent Coolen, Sebastien Peralta, Thierry Pauporte
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Materials Science, Multidisciplinary
Pham Nam Thang, Le Xuan Hung, Dao Nguyen Thuan, Nguyen Thu Loan, Guillaume Binard, Willy Daney de Marcillac, Agnes Maitre, Nguyen Quang Liem, Laurent Coolen, Pham Thu Nga
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Chemistry, Multidisciplinary
Sarra Gam-Derouich, Celine Bourdillon, Soraya Lakhdar Chaouche, Laurent Coolen, Agnes Maitre, Claire Mangeney, Catherine Schwob
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2017)
