Search results for "Optical rectification"
showing 4 items of 14 documents
The role of nonlinear optical absorption in narrowband difference-frequency terahertz-wave generation
2010
We present a general analysis of the influence of nonlinear optical absorption on terahertz generation via optical difference frequency generation, when reaching for the quantum conversion efficiency limit. By casting the equations governing the process in a suitably normalized form, including either two-photon- or three-photon-absorption terms, we have been able to plot universal charts for phase matched optical-to-terahertz conversion for different values of the nonlinear absorption coefficients. We apply our analysis to some experiments reported to date, in order to understand to what extent multiphoton absorption could have played a role and also to predict the maximum achievable conver…
Numerical Model of THz sources and detectors based on Optical Rectification and Electro-Optic Sampling
2013
A model describing a laser based set-up for wideband THz generation and detection is presented. Particular attention is focused on the main broadband phenomena, which occur when THz radiations have to be handled.
Spatio-temporal Characteristics of THz Emission at the Subwavelength Scale via Optical Rectification
2011
Highly localized THz emission via optical rectification in thin nonlinear crystals is a promising method for subwavelength microscopy. We present here the peculiar THz spatio-temporal characteristics induced by the non-paraxial generation regime.
Rectifications optique et thermique générées à l'aide de jonctions tunnel planaires électromigrées
2017
The work described in this manuscrit consists in studying the optical rectification within plasmo-electronic devices. These ultra-compact optically adressed components with an ultra-fast time response induces a conversion of the incident field into a static current. The monolithically-integrated electronically optical antenna requires a detailed knowledge of nanoscale thermal and electrical transport mechanisms. This work also aims to discuss all thermal effects inherent in the optical excitation of these connected devices, in order to identify the different contributions in the generation of a photo-assisted current.