Patterned femtosecond laser excitation of terahertz leaky modes in GaAs photonic crystals

2006 ◽  
Vol 89 (24) ◽  
pp. 241112 ◽  
Author(s):  
Nathan Jukam ◽  
Cristo Yee ◽  
Mark S. Sherwin ◽  
Ilya Fushman ◽  
Jelena Vučković
Keyword(s):  
Photonic Crystals ◽  
Femtosecond Laser ◽  
Laser Excitation ◽  
Leaky Modes

scholarly journals Fluence-dependent dynamics of the 5d6s exchange splitting in Gd metal after femtosecond laser excitation

2016 ◽  
Vol 55 (7S3) ◽  
pp. 07MD02 ◽  
Author(s):  
Björn Frietsch ◽  
Robert Carley ◽  
Markus Gleich ◽  
Martin Teichmann ◽  
John Bowlan ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Excitation ◽  
Exchange Splitting

scholarly journals Two-dimensional photonic crystals increasing vertical light emission from Si nanocrystal-rich thin layers

2018 ◽  
Vol 9 ◽  
pp. 2287-2296
Author(s):  
Lukáš Ondič ◽  
Marian Varga ◽  
Ivan Pelant ◽  
Alexander Kromka ◽  
Karel Hruška ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Light Emission ◽  
Periodic Structures ◽  
Normal Direction ◽  
Thin Layers ◽  
Two Dimensional ◽  
Lattice Constants ◽  
Leaky Modes ◽  
Si Nanocrystals ◽  
Si Nanocrystal

We have fabricated two-dimensional photonic crystals (PhCs) on the surface of Si nanocrystal-rich SiO2 layers with the goal to maximize the photoluminescence extraction efficiency in the normal direction. The fabricated periodic structures consist of columns ordered into square and hexagonal pattern with lattice constants computed such that the red photoluminescence of Si nanocrystals (SiNCs) could couple to leaky modes of the PhCs and could be efficiently extracted to surrounding air. Samples having different lattice constants and heights of columns were investigated in order to find the configuration with the best performance. Spectral overlap of the leaky modes with the luminescence spectrum of SiNCs was verified experimentally by measuring photonic band diagrams of the leaky modes employing angle-resolved spectroscopy and also theoretically by computing the reflectance spectra. The extraction enhancement within different spatial angles was evaluated by means of micro-photoluminescence spectroscopy. More than 18-fold extraction enhancement was achieved for light propagating in the normal direction and up to 22% increase in overall intensity was obtained at the spatial collection angle of 14°.

Enhanced green upconversion emission of Er^3+ through energy transfer by Dy^3+ under 800 nm femtosecond-laser excitation

2008 ◽  
Vol 33 (7) ◽  
pp. 693 ◽  
Author(s):  
Ai-Hua Li ◽  
Qiang Lü ◽  
Zhi-Ren Zheng ◽  
Liang Sun ◽  
Wen-Zhi Wu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Femtosecond Laser ◽  
Laser Excitation ◽  
Upconversion Emission

Ultrafast Dynamics of Photoexcited Charge Carriers in In0.53Ga0.47As/In0.52Al0.48As Superlattices under Femtosecond Laser Excitation

2018 ◽  
Vol 52 (7) ◽  
pp. 864-869 ◽  
Author(s):  
D. S. Ponomarev ◽  
R. A. Khabibullin ◽  
A. N. Klochkov ◽  
A. E. Yachmenev ◽  
A. S. Bugaev ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Excitation ◽  
Charge Carriers ◽  
Ultrafast Dynamics

Direct observation of elastic softening immediately after femtosecond-laser excitation in a phase-change material

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Tomoya Kawaguchi ◽  
Kazuya Tokuda ◽  
Seiya Okada ◽  
Makina Yabashi ◽  
Tetsu Ichitsubo ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Phase Change ◽  
Phase Change Material ◽  
Direct Observation ◽  
Laser Excitation ◽  
Change Material ◽  
Elastic Softening
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