Results 71 to 80 of about 14,300 (240)

Experimental Evidence of Free Carrier Generation in 2D Hybrid Organic–Inorganic Perovskites

Advanced Optical Materials, EarlyView.
ABSTRACT Despite the significant potential of 2D hybrid organic–inorganic perovskites (2DHOIPs) for high‐efficiency optoelectronics application‐comparable to their 3D counterparts, the fundamental carrier photogeneration remains unclear. In contrast to conventional ultrafast optical property characterization, we use ultrafast photocurrent spectroscopy ...
Tuhin Ghosh, Pan Adhikari, Yao Gao, Apparao M. Rao, Dawen Li, Haimei Zheng, Ying Shi, Letian Dou, Jianbo Gao   +8 more
wiley   +1 more source

From vertical-cavities to hybrid metal/photonic-crystal nanocavities: towards high-efficiency nanolasers [PDF]

, 2012
We provide a numerical study showing that a bottom reflector is indispensable to achieve unidirectional emission from a photonic-crystal (PhC) nanolaser.
Huang, Jingqing, Kim, Se-Heon, Scherer, Axel   +2 more
core   +1 more source

Efficient Analysis of Photonic Crystal Slabs [PDF]

Journal of Lasers, Optics & Photonics, 2014
In this paper we propose an accelerated plane wave expansion method (PWEM) for calculation of slab photonic crystal (slab PC) modes. In this method instead of creating artificial periodicity in the direction of slab normal and solving the problem as a full 3D one, which is done in standard PWEM, we consider constant coefficients in 2D PWEM as functions
Mohammad Hasan Aram, Sina Khorasani
openaire   +1 more source

Photonic Time Crystals and Time‐Varying Electromagnetic Metamatter: A New Direction for Ultrafast Tunable Photonic and Microwave Materials and Devices

Advanced Science, EarlyView.
Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel, Shriram Ramanathan, Ronald P. Jenkins, Michael J. Carter   +3 more
wiley   +1 more source

On-chip room-temperature CW lasing from a III–V nanowire integrated with a Si photonic crystal platform [PDF]

APL Photonics
We report the demonstration of continuous-wave (CW) lasing at room temperature from a III–V semiconductor nanowire integrated into a Si photonic crystal (PhC) cavity. Previous hybrid nanowire lasers [M.
Masato Takiguchi, Takuro Fujii, Hisashi Sumikura, Akihiko Shinya, Shinji Matsuo, Masaya Notomi   +5 more
doaj   +1 more source

High quality two-dimensional photonic crystal slab cavities [PDF]

, 2001
We have fabricated and characterized donor-mode nanocavities formed by a single defect cavity defined within a two-dimensional photonic crystal slab. Quantum dots emitting in the 1.1-1.3 micron range were used as luminescence sources, and a design using ...
Chen, Hao, Deppe, Dennis, Scherer, Axel, Vučković, Jelena, Yoshie, Tomoyuki   +4 more
core   +1 more source

Toward Reliable Metal Halide Perovskite FETs: From Electronic Structure and Device Physics to Stability and Performance Engineering

Advanced Electronic Materials, EarlyView.
Metal halide perovskite field‐effect transistors (PeFETs) offer great promise for flexible, low‐cost, and high‐performance due to their excellent charge carrier properties. However, challenges like ion migration, hysteresis, and instability limit their performance.
Georgios Chatzigiannakis, Anastasia Soultati, Leonidas C. Palilis, Ermioni Polydorou, Konstantinos Davazoglou, Petros‐Panagis Filippatos, Goutham Raj Perumallapelli, Ravindra Naik Bukke, Abd. Rashid bin Mohd Yusoff, Ilhwan Ryu, Peng Gao, Alexander Chroneos, Mohammad Khaja Nazeeruddin, Maria Vasilopoulou   +13 more
wiley   +1 more source

Low Threshold, Wide Dynamic Range, Tunable, All-Optical Self-Modulator Based on Fano Resonance and Out-of-Plane Coupling in a Slab Photonic Crystal with a Graphene Layer

Journal of Nanotechnology, 2015
We demonstrate an all-optical modulator based on self-modulation in a one-dimensional slab photonic crystal (PhC) by using optical Kerr nonlinearity of graphene and Fano resonance effect.
Reza Asadi, Zhengbiao Ouyang
doaj   +1 more source

Active quasi-BIC optical vortex generators for ultrafast switching

New Journal of Physics, 2022
The Pancharatnam–Berry phase induced by the winding topology of polarization around a vortex singularity at bound states in the continuum (BIC) provides a unique approach to optical vortex (OV) generation.
Yuhao Wu, Lei Kang, Douglas H Werner
doaj   +1 more source

Spontaneous emission rates of dipoles in photonic crystal membranes

, 2005
We show theoretically that finite two-dimensional (2D) photonic crystals in thin semiconductor membranes strongly modify the spontaneous emission rate of embedded dipole emitters.
A. Femius Koenderink, Akahane, Amos, Asatryan, Buchler, Busch, Busch, Bykov, Chew, Cornelius, Costas M. Soukoulis, Daubechies, Drexhage, Englund, Fan, Fujita, Fussell, Gilat, Hermann, Hess, Ho, Hwang, Khosravi, Kien, Klimov, Koenderink, Koenderink, Koenderink, Kress, Lee, Li, Lodahl, Maria Kafesaki, Monkhorst, Ogawa, Okano, Olk, Painter, Schniepp, Shung, Snoeks, Sprik, Srinivasan, Suzuki, Urbach, Vahala, Vahid Sandoghdar, Vlasov, Vos, Wang, Xu, Yablonovitch, Yanik, Yoshie   +53 more
core   +1 more source