data transmission in optical systems and increased transmission distance capacity benefit by using optical amplification wavelength division multiplexing (wdm) technology. the combination of four waves (fwm) is a non-linear effect in the wavelength division multiplex (wdm), when more than two wavelengths of light in a fiber launch will occur. fwm amount depends on the channel, the channel spaci...

we will present a detailed investigation of intersubband transitions process in core-multi shells quantum dots. the confined wave functions and eigenenergies of electrons in quantum dots have been calculated under the effective-mass approximation by solving a three-dimensional schrodinger equation. excellent dependence is found between size effects, time relaxation and degenerate four wave mixi...

We report on the development of a superresolution four-wave mixing microscope with spatial resolution approaching 130 nm which represents better than twice the diffraction limit at 800 nm while retaining the ability to acquire materials- and chemical- specific contrast. The resolution enhancement is achieved by narrowing the microscope's excitation volume in the focal plane through the combined...

Yanpeng Zhang,1,* Zhiguo Wang,1 Huaibin Zheng,1 Chenzhi Yuan,1 Changbiao Li,1 Keqing Lu,1 and Min Xiao2,† 1Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi’an Jiaotong University, Xi’an 710049, China 2Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA (Received 10 November 2009;...

We consider a topological Floquet insulator realized as honeycomb array of helical waveguides imprinted in weakly birefringent medium. The system accounts for four-wave mixing occurring at series resonances arising due to phase matching. Under these resonant conditions, the sustains stable linearly polarized and metastable elliptically two-component edge solitons. Coupled nonlinear equations de...