Liquid-crystals-plasmonics for ultrafast broadband all-optical switching

2011 ◽  
Vol 1293 ◽  
Author(s):  
I. C. Khoo ◽  
J. Huang ◽  
S. Zhou ◽  
J. Liou ◽  
K. L. Hong ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Optical Switching ◽  
Near Infrared ◽  
Response Times ◽  
Nano Particles ◽  
Optical Nonlinearities ◽  
Ultrafast Optical ◽  
Ordered Phases ◽  
Rapid Transmission ◽  
All Optical Switching

ABSTRACTWe present the results and critical analyses of recent studies of ultrafast optical nonlinearities of liquid crystals in the isotropic and ordered phases for time scales spanning femtoseconds – microseconds. Pure undoped liquid crystals as well as liquid crystals containing plasmonic nano-particles have been investigated. Individual molecular electronic optical nonlinearities are found to be useful for femtoseconds – nanoseconds nonlinear transmission clamping applications. On the other hand, laser induced order parameter and birefringence modification in aligned nematic cells allow very rapid transmission switching of visible as well as near infrared lasers with response times in the sub-microseconds - few nanoseconds regime.

Optical nonlinearities and ultrafast all-optical switching of m-plane GaN in the near-infrared

2015 ◽  
Vol 106 (25) ◽  
pp. 251903 ◽  
Author(s):  
Yu Fang ◽  
Zhengguo Xiao ◽  
Xingzhi Wu ◽  
Feng Zhou ◽  
Junyi Yang ◽  
...  
Keyword(s):  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearities ◽  
All Optical ◽  
All Optical Switching

INTERBAND TWO-PHOTON TRANSITION IN MOTT INSULATOR AS A NEW MECHANISM FOR ULTRAFAST OPTICAL NONLINEARITY

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3628-3632 ◽  
Author(s):  
M. Ashida ◽  
T. Ogasawara ◽  
N. Motoyama ◽  
H. Eisaki ◽  
S. Uchida ◽  
...  
Keyword(s):  
Excited State ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Infrared Region ◽  
Pump Probe ◽  
Two Photon ◽  
Ultrafast Optical ◽  
Order Of Magnitude ◽  
Probe Transmission

The dimensionality dependence of optical nonlinearity in cuprates was investigated by sub-picosecond pump-probe transmission measurements in the near-infrared region. It was found that cuprates with one-dimensional Cu-O networks show nonlinearity one order of magnitude larger than that of conventional band semiconductors and picosecond relaxation of the excited state. In contrast, a two-dimensional cuprate shows one order of magnitude smaller nonlinearity and slower decay of the excited state, as well as picosecond relaxation. The possibility for application of the present material to all-optical switching devices is also discussed.

scholarly journals Ultrafast sub–30-fs all-optical switching based on gallium phosphide

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw3262 ◽  
Author(s):  
Gustavo Grinblat ◽  
Michael P. Nielsen ◽  
Paul Dichtl ◽  
Yi Li ◽  
Rupert F. Oulton ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
All Optical Switching

Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (λ > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub–30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by theZ-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.

NONLINEAR AND ELECTRO-OPTICS OF NANO-DISPERSED NEMATIC LIQUID CRYSTALS WITH TUNABLE NEGATIVE-, ZERO-, AND POSITIVE INDICES

2007 ◽  
Vol 16 (03) ◽  
pp. 381-399 ◽  
Author(s):  
I. C. KHOO ◽  
A. DIAZ ◽  
D. KWON ◽  
D. H. WERNER ◽  
J. LIOU ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Response Times ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity ◽  
Frequency Selective Surfaces ◽  
Optical Nonlinearities ◽  
Crystal Matrix ◽  
Liquid Crystal Matrix ◽  
Positive Index

We present a review of recent progress in the studies of the nonlinear- and electro-optics of liquid crystals, particularly in their meta-material forms. An analytical expression for the "ultimate" optical nonlinearity of nematic liquid crystals is obtained, and several routes to realizing such optical nonlinearities are discussed. We also describe two approaches for realizing tunable or reconfigurable negative-zero-positive index materials: (1) planar nano-structured frequency selective surfaces [FSS] containing nematic liquid crystals; (2) core-shell nano-spheres randomly distributed in bulk nematic liquid crystal matrix. Such metamaterials can be designed for applications in the visible-infrared, as well as Terahertz and microwave regimes. These liquid crystalline meta-materials are capable of supra-nonlinearities characterized by refractive index changing coefficients of over 1 cm2/watt and microseconds response times.

All-optical switching and logic gating with spatial solitons in liquid crystals

2002 ◽  
Vol 81 (18) ◽  
pp. 3335-3337 ◽  
Author(s):  
Marco Peccianti ◽  
Claudio Conti ◽  
Gaetano Assanto ◽  
Antonio De Luca ◽  
Cesare Umeton
Keyword(s):  
Liquid Crystals ◽  
Optical Switching ◽  
Spatial Solitons ◽  
All Optical ◽  
All Optical Switching
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