Laser-induced periodic surface structures: Fingerprints of light localization

Abstract

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. The finite-difference time-domain (FDTD) method is used to study the inhomogeneous absorption of linearly polarized laser radiation below a rough surface. The results are first analyzed in the frequency domain and compared to the efficacy factor theory of Sipe and coworkers. Both approaches show that the absorbed energy shows a periodic nature, not only in the direction orthogonal to the laser polarization, but also in the direction parallel to it. It is shown that the periodicity is not always close to the laser wavelength for the perpendicular direction. In the parallel direction, the periodicity is about λ/Re(ñ), withñ being the complex refractive index of the medium. The space-domain FDTD results show a periodicity in the inhomogeneous energy absorption similar to the periodicity of the low-and high-spatial-frequency laser-induced periodic surface structures depending on the material's excitation.

Femtosecond laser induced phenomena in transparent solid materials: Fundamentals and applications

“…The influence of polarization, angle of incidence, and wavelength of the incident laser beam implies that LSFLs formation is mainly governed by the electromagnetic field [272,273]. Therefore, LSFLs are widely considered to be the result of the interference between an incident wave and a surface scattered wave [274][275][276]. Bonse et al study the dynamics and the femtosecond-LIPSSs with double pulses irradiation, and show that the pulse delay between subpulses has a strong impact on the formation of nanostructures [263,277,278].…”

Toward the formation of crossed laser-induced periodic surface structures

“…The analytic solutions of the Sipe-Drude theory, however, cannot properly describe the type-r behavior because they are obtained under a small frequency approximation. 23 In the frequency domain, the amplitude of the type-r behavior tends to grow indefinitely for larger frequencies. In this regime, a numerical solution easily solves this difficulty.…”

From random inhomogeneities to periodic nanostructures induced in bulk silica by ultrashort laser

“…This interference causes periodic energy deposition [93][94][95]. In addition, an interference of the incident wave with the excited surface plasmon polaritons also leads to an enhancement of surface periodic structure formation under the conditions required for the surface plasmons [96][97][98][99][100].…”