Subwavelength Localization of Optical Modes in Fractals

1994 ◽  
Vol 351 ◽  
Author(s):  
Vladimir Shalaev ◽  
R. Botet ◽  
M. Moskovits
Keyword(s):  
Nonlinear Optical ◽  
Optical Excitation ◽  
Four Wave Mixing ◽  
Local Fields ◽  
Wave Mixing ◽  
Fractal Clusters ◽  
Raman Light Scattering ◽  
Optical Effects ◽  
Optical Modes ◽  
Very High

ABSTRACTResonant optical excitation of fractal clusters generates dipolar eigenmodes which are extremely localized within areas much smaller than the wavelength. The localization occurs due to the fractal morphology and accounts for the very high local fields leading to the huge enhancement of various optical effects. In particular, Rayleigh and Raman light scattering and, especially, nonlinear optical processes, such as 2-photon photoemission and degenerate four-wave mixing, are strongly enhanced in fractal clusters. The spatial distribution of the modes shows the frequency and polarization selectivity.

RESONANT OPTICS OF FRACTALS

Fractals ◽  
1994 ◽  
Vol 02 (02) ◽  
pp. 201-209 ◽  
Author(s):  
VLADIMIR SHALAEV ◽  
V. A. MARKEL ◽  
V. P. SAFONOV ◽  
R. BOTET
Keyword(s):  
Harmonic Generation ◽  
Four Wave Mixing ◽  
Local Fields ◽  
Photon Absorption ◽  
Wave Mixing ◽  
High Quality ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Effects ◽  
Optical Modes

Fractal objects can sustain strongly localized optical modes with high quality-factor. Intense local fields associated with the dipolar eigenmodes in fractals ultimately result in significant enhancement of a number of optical effects. In particular, such basic optical processes as Rayleigh and Raman scattering, degenerate four-wave mixing and harmonic generation, two-photon absorption and non-linear photoemission can be enhanced by several orders of magnitude in small-particle fractal composites and self-affine films.

scholarly journals Observation of Nonlinear Optical Phenomenon in Vacuum by Four Waves Mixing

2021 ◽  
Author(s):  
Pramila Shukla ◽  
Ranjana Prakash
Keyword(s):  
Probe Beam ◽  
Nonlinear Optical ◽  
Four Wave Mixing ◽  
Signal Beam ◽  
Wave Mixing ◽  
Mixing Process ◽  
Optical Phenomenon ◽  
Optical Effects ◽  
Nonlinear Optical Effects ◽  
Nonlinear Optical Phenomenon

Abstract In the present paper, we studied possibility of observation and detection of nonlinear optical effects in free space. We studied four wave mixing process in which signal is generated opposite to the direction of probe beam. We observed that large number of photons are generated in signal beam, which should be detectable.

scholarly journals Four-wave mixing and enhanced analog Hawking effect in a nonlinear optical waveguide

2019 ◽  
Vol 99 (4) ◽  
Author(s):  
Scott Robertson ◽  
Charles Ciret ◽  
Serge Massar ◽  
Simon-Pierre Gorza ◽  
Renaud Parentani
Keyword(s):  
Optical Waveguide ◽  
Nonlinear Optical ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Hawking Effect

Theoretical and Experimental Studies of Third-Order Nonlinear Optical Susceptibilities of New p-N,N'-Diamethylaniline Tetrathiafulvalene Derivatives

2000 ◽  
Vol 660 ◽  
Author(s):  
B. Sahraoui ◽  
K.J. Pluciński ◽  
M. Makowaska-Janusik ◽  
I. V. Kityk ◽  
M. Salle ◽  
...  
Keyword(s):  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Nonlinear Optical ◽  
Experimental Studies ◽  
Physical Nature ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Electronic Contribution ◽  
Optical Nonlinearities ◽  
Third Order

ABSTRACTA study was made of third-order nonlinear optical susceptibilities of new tetrathiafulvalene (TTF) derivatives, using the degenerate four wave mixing (DFWM) method, as well as complex quantum chemical calculations. To understand the physical nature of the optical nonlinearities, we separated their electronic and nuclear contributions. We found that the electronic contribution to these nonlinearities predominated. Our investigations suggest that TTF may be a highly promising material for nonlinear optics (NLO).

HIGHLY ACCURATE WAVELENGTH SCANNED FOUR-WAVE MIXING EXPERIMENT IN AN OPTICAL FIBER AND DEMONSTRATION OF RETRIEVAL OF ITS LINEAR AND NONLINEAR OPTICAL PARAMETERS

2006 ◽  
Vol 15 (01) ◽  
pp. 141-156
Author(s):  
S. J. JUNG ◽  
J. Y. LEE ◽  
D. Y. KIM
Keyword(s):  
Optical Fiber ◽  
Nonlinear Optical ◽  
Chromatic Dispersion ◽  
Tunable Laser ◽  
Four Wave Mixing ◽  
Optical Parameters ◽  
Wave Mixing ◽  
Dependent Change ◽  
Measurement Results ◽  
Linear And Nonlinear

Accurate wavelength scanned four-wave mixing (FWM) measurement results in an optical fiber are presented with two tunable laser sources near the dispersion-zero wavelength of the fiber. By comparing the measured FWM data with a simple analytic expression, we have demonstrated that important linear and nonlinear optical properties such as zero-dispersion wavelength, dispersion slope and nonlinear refractive index of the sample fiber. Highly accurate and repeatable measurement results for a sample fiber are presented. Temperature-dependent change in the chromatic dispersion of a fiber is also investigated.

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