37905
2016
eng
115007
11
18
article
IOP Publishing Ltd
1
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Properties of surface plasmon polaritons on lossy materials: lifetimes, periods and excitation conditions
The possibility to excite surface plasmon polaritons (SPPs) at the interface between two media depends on the optical properties of both media and geometrical aspects. Specific conditions allowing the coupling of light with a plasmon-active interface must be satisfied. Plasmonic effects are well described in noble metals where the imaginary part of the dielectric permittivity is often neglected ('perfect medium approximation (PMA)'). However, some systems exist for which such approximation cannot be applied, hence requiring a refinement of the common SPP theory. In this context, several properties of SPPs such as excitation conditions, period of the electromagnetic field modulation and SPP lifetime then may strongly deviate from that of the PMA. In this paper, calculations taking into account the imaginary part of the dielectric permittivities are presented. The model identifies analytical terms which should not be neglected in the mathematical description of SPPs on lossy materials. These calculations are applied to numerous material combinations resulting in a prediction of the corresponding SPP features. A list of plasmon-active interfaces is provided along with a quantification of the above mentioned SPP properties in the regime where the PMA is not applicable.
Journal of Optics
10.1088/2040-8978/18/11/115007
2040-8986 (online) / 2040-8978 (print)
24.11.2016
T. J.-Y. Derrien
Jörg Krüger
Jörn Bonse
eng
uncontrolled
plasmon lifetime
eng
uncontrolled
surface plasmon polaritons
eng
uncontrolled
lossy materials
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
38689
2016
eng
e46, 1
8
4
article
Cambridge University Press
0
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Excitation and relaxation dynamics in ultrafast laser irradiated optical glasses
We discuss the dynamics of ultrashort pulsed laser excitation in bulk optical silica-based glasses (fused silica and borosilicate BK7) well-above the permanent modification threshold. We indicate subsequent structural and thermomechanical energy relaxation paths that translate into positive and negative refractive index changes, compression and rarefaction zones. If fast electronic decay occurs at low excitation levels in fused silica via self-trapping of excitons, for carrier densities in the vicinity of the critical value at the incident wavelength, persistent long-living absorptive states indicate the achievement of low viscosity matter states manifesting pressure relaxation, rarefaction, void opening and compaction in the neighboring domains. An intermediate ps-long excited carrier dynamics is observed for BK7 in the range corresponding to structural expansion and rarefaction. The amount of excitation and the strength of the subsequent hydrodynamic evolution is critically dependent on the pulse time envelope, indicative of potential optimization schemes.
High Power Laser Science and Engineering
10.1017/hpl.2016.45
2095-4719
2052-3289
C. Mauclair
A. Mermillod-Blondin
K. Mishchik
Jörn Bonse
A. Rosenfeld
J. P. Colombier
R. Stoian
eng
uncontrolled
Ultrafast laser excitation
eng
uncontrolled
Refractive index engineering
eng
uncontrolled
Glasses
eng
uncontrolled
Carrier plasmas
eng
uncontrolled
Pulse shaping
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
38637
2016
eng
969
974
12
41
article
Cambride University Press
Materials Research Society
1
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Ultrafast laser-induced morphological transformations
Ultrafast laser processing can be used to realize various morphological surface transformations, ranging from direct contour shaping to large-area-surface functionalization via the generation of “self-ordered” micro- and nanostructures as well as their hierarchical hybrids. Irradiation with high-intensity laser pulses excites materials into extreme conditions, which then return to equilibrium through these unique surface transformations. In combination with suitable top-down or bottom-up manufacturing strategies, such laser-tailored surface morphologies open up new avenues toward the control of optical, chemical, and mechanical surface properties, featuring various technical applications especially in the fields of photovoltaics, tribology, and medicine. This article reviews recent efforts in the fundamental understanding of the formation of laser-induced surface micro- and nanostructures and discusses some of their emerging capabilities.
MRS Bulletin
10.1557/mrs.2016.271
0883-7694
1938-1425
02.02.2017
M. J. Abere
M. Zhong
Jörg Krüger
Jörn Bonse
eng
uncontrolled
Laser ablation
eng
uncontrolled
Laser-induced periodic surface structures (LIPSS)
eng
uncontrolled
Surface morphology
eng
uncontrolled
Oxidation
eng
uncontrolled
Tribology
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
35602
2016
eng
111904-1
111904-4
11
108
article
AIP Publishing LLC
1
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Regularly arranged indium islands on glass/molybdenum substrates upon femtosecond laser and physical vapor deposition processing
A bottom-up approach is presented for the production of arrays of indium islands on a molybdenum layer on glass, which can serve as micro-sized precursors for indium compounds such as copper-indium-gallium-diselenide used in photovoltaics. Femtosecond laser ablation of glass and a subsequent deposition of a molybdenum film or direct laser processing of the molybdenum film both allow the preferential nucleation and growth of indium islands at the predefined locations in a following indium-based physical vapor deposition (PVD) process. A proper choice of laser and deposition parameters ensures the controlled growth of indium islands exclusively at the laser ablated spots. Based on a statistical analysis, these results are compared to the non-structured molybdenum surface, leading to randomly grown indium islands after PVD.
Applied Physics Letters
10.1063/1.4943794
0003-6951
26.04.2016
F. Ringleb
K. Eylers
T. Teubner
T. Boeck
Christian Symietz
Jörn Bonse
Stefan Andree
Jörg Krüger
B. Heidmann
M. Schmid
M. Lux-Steiner
eng
uncontrolled
Femtosecond laser
eng
uncontrolled
Physical vapor deposition
eng
uncontrolled
Indium
eng
uncontrolled
Molybdenum substrate
eng
uncontrolled
Microconcentrator solar cell
Angewandte Physik
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
35937
2016
eng
190
196
374
article
Elsevier B.V.
Amsterdam, Netherlands
1
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Tribological performance of sub-100-nm femtosecond laser-induced periodic surface structures on titanium
Sub-100-nm laser-induced periodic surface structures (LIPSS) were processed on bulk titanium (Ti) surfaces by femtosecond laser pulse irradiation in air (30 fs pulse duration, 790 nm wavelength). The laser peak fluence, the spatial spot overlap, and the number of overscans were optimized in a sample-scanning geometry in order to obtain large surface areas (5 mm × 5 mm) covered homogeneously by the LIPSS. The laser-processed regions were characterized by optical microscopy (OM), white light interference microscopy (WLIM) and scanning electron microscopy (SEM). The friction coefficient of the nanostructured surfaces was tested during 1000 cycles under reciprocal sliding conditions (1 Hz, 1.0 N normal load) against a 10-mm diameter ball of hardened 100Cr6 steel, both in paraffin oil and in engine oil used as lubricants. Subsequently, the corresponding wear tracks were qualified by OM, SEM, and energy dispersive X-ray analyses (EDX). The results of the tribological tests are discussed and compared to that obtained for near wavelength-sized fs-LIPSS, processed under somewhat different irradiation conditions. Some constraints for a beneficial effect of LIPSS on the tribological performance are provided.
Applied Surface Science
10.1016/j.apsusc.2015.11.019
http://www.sciencedirect.com/science/article/pii/S0169433215026987
0169-4332
1873-5584
09.06.2016
Jörn Bonse
S. Höhm
Robert Koter
Manfred Hartelt
Dirk Spaltmann
Simone Pentzien
A. Rosenfeld
Jörg Krüger
eng
uncontrolled
Femtosecond laser ablation
eng
uncontrolled
Laser-induced periodic surface structures, LIPSS
eng
uncontrolled
Friction
eng
uncontrolled
Wear
eng
uncontrolled
Nanostructures
eng
uncontrolled
Surface functionalization
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
35938
2016
eng
331
338
374
article
Elsevier
Amsterdam, Netherlands
1
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Dynamics of the formation of laser-induced periodic surface structures (LIPSS) upon femtosecond two-color double-pulse irradiation of metals, semiconductors, and dielectrics
In order to address the dynamics and physical mechanisms of LIPSS formation for three different classes of materials (metals, semiconductors, and dielectrics), two-color double-fs-pulse experiments were performed on Titanium, Silicon and Fused Silica. For that purpose a Mach–Zehnder interferometer generated polarization controlled (parallel or cross-polarized) double-pulse sequences at 400 nm and 800 nm wavelength, with inter-pulse delays up to a few picoseconds. Multiple of these two-color double-pulse sequences were collinearly focused by a spherical mirror to the sample surfaces. The fluence of each individual pulse (400 nm and 800 nm) was always kept below its respective ablation threshold and only the joint action of both pulses lead to the formation of LIPSS. Their resulting characteristics (periods, areas) were analyzed by scanning electron microscopy. The periods along with the LIPSS orientation allow a clear identification of the pulse which dominates the energy coupling to the material. For strong absorbing materials (Silicon, Titanium), a wavelength-dependent plasmonic mechanism can explain the delay-dependence of the LIPSS. In contrast, for dielectrics (Fused Silica) the first pulse always dominates the energy deposition and LIPSS orientation, supporting a non-plasmonic formation scenario. For all materials, these two-color experiments confirm the importance of the ultrafast energy deposition stage for LIPSS formation.
Applied Surface Science
10.1016/j.apsusc.2015.12.129
http://www.sciencedirect.com/science/article/pii/S0169433215031347
0169-4332
1873-5584
09.06.2016
S. Höhm
M. Herzlieb
A. Rosenfeld
Jörg Krüger
Jörn Bonse
eng
uncontrolled
Femtosecond laser ablation
eng
uncontrolled
Double-pulse experiments
eng
uncontrolled
Laser-induced periodic surface structures (LIPSS)
eng
uncontrolled
Mach-Zehnder interferometer
eng
uncontrolled
Ultrafast optical techniques
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
35939
2016
eng
1
1
374
article
Elsevier B.V.
Amsterdam, Netherlands
1
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Preface - E-MRS 2015 Spring Meeting Symposium CC: “Laser and plasma processing for advanced applications in material science”, 11-15 May 2015, Lille (France)
This article represents the editorial preface for the proceedings of the Symposium CC “Laser and plasma processing for advanced applications in material science” held from May 11th to 15th 2015 in the Lille Grand Palais, France, during the annual Spring Meeting of the European Materials Research Society (E-MRS).
Applied Surface Science
10.1016/j.apsusc.2016.03.231
http://www.sciencedirect.com/science/article/pii/S0169433216307243
0169-4332
1873-5584
09.06.2016
Jörn Bonse
I. Zergioti
P. Delaporte
N. D. Scarisoreanu
eng
uncontrolled
Laser processing
eng
uncontrolled
Plasma processing
eng
uncontrolled
Material sciences
eng
uncontrolled
Advanced applications
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")