Results 131 to 140 of about 534,558 (401)

Four-Wave mixing in degenerate Fermi gases: Beyond the undepleted pump approximation

, 2003
We analyze the full nonlinear dynamics of the four-wave mixing between an incident beam of fermions and a fermionic density grating. We find that when the number of atoms in the beam is comparable to the number of atoms forming the grating, the dephasing
A.G. Rojo, A.G. Truscott, B. DeMarco, B. DeMarco, C. McKenzie, C. P. Search, F. Schreck, G. Lenz, G. Roati, H. Christ, H.P. Yuen, J.M. Vogels, K.E. Strecker, K.M. O’Hara, L. Deng, M. Kozuma, M.G. Moore, P. Meystre, P. Villain, R. Wynar, R.E. Slusher, S. Burger, S. Innouye, T. Miyakawa, W. Ketterle, Y. Torii, Z. Hadzibabic   +26 more
core   +1 more source

Multi‐Pathway Upconversion Emission in Symmetry‐Broken Nanocavities: Broadband Multiresonant Enhancement and Anti‐Correlated Interfacial Sensitivity

Advanced Functional Materials, EarlyView.
Symmetry‐broken plasmonic nanoantenna arrays achieve broadband multiresonant enhancement of second harmonic generation (SHG), third harmonic generation (THG), and upconversion photoluminescence (UCPL), under femtosecond laser excitation across the near‐infrared range (1000–1600 nm).
Elieser Mejia, Yuming Zhao, Meitong Nie, Benjamin Pittelkau, Aditya Garg, Junyeob Song, Wenqi Zhu, Henri Lezec, Amit Agrawal, Wei Zhou   +9 more
wiley   +1 more source

Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast

Nanomaterials, 2019
Subwavelength gratings have been of great interest recently due to their ability to eliminate multiple orders. However, high index contrast ( Δ n ∼ 3 ) is typically achieved using metals or high-index dielectrics surrounded by vacuum in ...
Tao Li, Mohamed Asbahii, Jian-Yee Lim, Hong Xie, Chan-Wai Koh, Min-Hao Goh, Kian-Soo Ong, Hang Zhang, Ding Ding   +8 more
doaj   +1 more source

Light trapping properties of cylindrical well diffraction gratings in solar cells: Computational calculations [PDF]

, 2010
Light trapping using diffraction gratings is a promising approach to increasing absorption in solar cells. In this paper, the computationally calculated absorption enhancement expected from a diffraction grating consisting of a triangular array of ...
Luque López, Antonio, Martí Vega, Antonio, Mellor Null, Alexander Virgil, Tobías Galicia, Ignacio   +3 more
core   +1 more source

III-Nitride grating grown on freestanding HfO2 gratings [PDF]

Nanoscale Research Letters, 2011
AbstractWe report here the epitaxial growth of III-nitride material on freestanding HfO2 gratings by molecular beam epitaxy. Freestanding HfO2 gratings are fabricated by combining film evaporation, electron beam lithography, and fast atom beam etching of an HfO2 film by a front-side silicon process.
F. R. Hu, Tong Wu, Yongjin Wang, Hongbo Zhu, Kazuhiro Hane, Yoshiaki Kanamori   +5 more
openaire   +4 more sources

Sono‐Piezo‐Photosynthesis of Ethylene and Acetylene from Bioethanol under Ambient Conditions

Advanced Functional Materials, EarlyView.
A novel sono‐piezo‐photocatalytic strategy enables the conversion of bioethanol to ethylene (C2H4) and acetylene (C2H2) under ambient conditions, addressing the limitations of conventional methods that are high‐temperature and energy‐intensive. By using an advanced graphene oxide/sodium bismuth titanate heterostructure catalyst, this work achieved ...
Yue Jiang, Jiajun Zhang, Hongyang Ma, Shujie Zhou, Hsun‐Yen Lin, Sajjad S. Mofarah, Mark Lockrey, Teng Lu, Hangjuan Ren, Xiaoran Zheng, Maichael Gunawan, Suchen Huang, Yu‐Chun Huang, Fenglin Zhuo, Dali Ji, Judy N. Hart, Yun Liu, Jyh Ming Wu, Muthupandian Ashokkumar, Danyang Wang, Pramod Koshy, Charles C. Sorrell   +21 more
wiley   +1 more source

Polarization-based branch selection of bound states in the continuum in dielectric waveguide modes anti-crossed by a metal grating

New Journal of Physics, 2019
We investigate bound states in the continuum (BICs) in a planar dielectric waveguide structure consisting of a gold grating on a dielectric layer with a back layer of metal.
R Kikkawa, M Nishida, Y Kadoya
doaj   +1 more source

Humidity responsivity of poly(methyl methacrylate)-based optical fiber Bragg grating sensors.

Optics Letters, 2014
The humidity response of poly(methyl methacrylate) (PMMA)-based optical fiber Bragg gratings (POFBGs) has been studied. The characteristic wavelength of the grating is modulated by water absorption-induced swelling and refractive index change in the ...
Wei Zhang, D. Webb
semanticscholar   +1 more source

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Wide bandwidth and high coupling efficiency Si3N4-on-SOI dual-level grating coupler.

Optics Express, 2014
We propose and experimentally demonstrate fiber-to-chip grating couplers with aligned silicon nitride (Si(3)N(4)) and silicon (Si) grating teeth for wide bandwidths and high coupling efficiencies without the use of bottom reflectors.
W. Sacher, Ying Huang, L. Ding, B. Taylor, H. Jayatilleka, G. Lo, J. Poon   +6 more
semanticscholar   +1 more source