Han: Generation of EUV radiation by plasmonic field enhancement using nano-structured bowties and funnel-waveguides

Generation of EUV radiation by plasmonic field enhancement using nano-structured bowties and funnel-waveguides

Recent experimental data of high-order harmonic generation (HHG), obtained by use of the plasmonic field enhancement of nanostructure bowties and funnel-waveguides, are presented. Emphasis is laid on reproduction of previous experimental results and also elucidation of the fundamental limitations associated with the nanostructure thermal damage, small laser-gas interaction volume, and atomic line emission in the plasmon-driven HHG process. In addition, the dominance of coherent harmonics is quantitatively verified by implementing a two-beam interference experiment using a pair of funnel-waveguides. This study proves that funnel-waveguides are a superior plasmonic device capable of providing not only high thermal immunity but also sufficient atom emitters to produce practically usable extreme-ultraviolet (EUV) radiation in a reproducible manner.

http://onlinelibrary.wiley.com/doi/10.1002/andp.201200160/abstract




Han's slides

Yusuke: HHG in aligned molecules with CEP-controlled pulses

High-order harmonics generated aligned molecules with CEP-controlled pulses are investigated. With short duration pulses harmonics are spectrally broadened due to non-adiabatic effect, which give rise to interferences between adjacent odd harmonics. The overlapped harmonics create interferences that become visible by locking the CEP. The interference contains the information of the phase of harmonics. We compare spectra generated with 25 fs pulses and spectra generated with 10 fs pulses. We have found some characteristics of the interference observing order dependence and molecular alignment dependence of the interference.

Simon: Efficient High Harmonic Generation

Discussion of phasematching aspects and recent experimental results from the attolab of HHG in capillaries and comparison to attotech style targets.

slides: http://charles.qols.ph.ic.ac.uk/~twitting/consJCDM/material/20121203_simon_hhg/121204%20Efficient%20High%20Harmonic%20Generation.pptx

Felicity: Spatiotemporal characterization of few-cycle laser pulses

In this paper we apply a broadband fiber optic coupler interferometer to the measurement of few-cycle laser pulses. Sub-8-fs pulses delivered by an ultrafast oscillator were characterized spatiotemporally using STARFISH, which is based on spatially resolved spectral interferometry. The reference pulse was measured with the d-scan technique. The pulses were focused by an off-axis parabolic mirror and were characterized at different transverse planes along the focusing region. The evolution of the retrieved pulses is analyzed, exhibiting small variations in the temporal (and spectral) amplitude and phase during propagation. Finally, the peak irradiance evolution is estimated from the integration of the spatiotemporal intensity.

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-16-17880

Marta: Laser Nanofabrication of Soft Matter

Laser based techniques constitute an advantageous versatile approach for the assembly and control at nanometer scale of polymers and biopolymers, fundamental components of soft matter. In this chapter lasernanostructuring of thin films of these materials will be illustrated by studies on laser induced periodic surface structures (LIPSS) and on laser foaming and on their respective application for surface enhanced Raman spectroscopy (SERS) based sensors and for scaffolds in tissue engineering.

Nacho: Time of flight mass spectrometry characterization of plasma plumes

a short presentation about my work on TOF-MS in Madrid and what a did here as well

Rashid: Plasma Harmonics, 2 years of study