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Structure formation on the surface of indium phosphide irradiated by femtosecond laser pulses
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10.1063/1.1827919
/content/aip/journal/jap/97/1/10.1063/1.1827919
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/1/10.1063/1.1827919
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

SFM topography of craters in InP processed by different numbers of laser pulses applied to the same spot: (a) , (b) , (c) , and (d) . Additionally, cross-sectional views along the dashed vertical lines are given. In each case, the upper end of the dashed line corresponds to the left-handed side of the corresponding cross-sectional profile. All the topography images are encoded by the same gray scale.

Image of FIG. 2.
FIG. 2.

Results of the two-dimensional Fourier transformation of the four SFM topography images shown in Fig. 1. (a) , (b) , (c) , and (d) . The Fourier amplitudes are encoded in a linear gray scale, with the dark regions representing the high values. In (c), the opening angle of the sickle-shaped LSFL feature is indicated.

Image of FIG. 3.
FIG. 3.

Evolution of (a) the lateral periods of the LSFL and HSFL ripples, (b) the opening angle of the sickle-shaped LSFL feature in the 2D-FT, and (c) the maximum Fourier amplitudes of both ripple-types as a function of the pulse number per spot . Typical examples of the 2D-FTs used for evaluation and parts of the corresponding SEM images are displayed in (d). The dimension of the long axis of the SEM images is . In (d), the Fourier amplitudes are encoded in a linear gray scale, with the dark regions representing the high values.

Image of FIG. 4.
FIG. 4.

SEM images of a surface region irradiated by ten subsequent laser pulses ; (a) overview, (b) detail. The LSFL and HSFL rippled regions are marked by arrows in (b).

Image of FIG. 5.
FIG. 5.

Fourier analysis of a SEM image (a) of a surface region irradiated by ten subsequent laser pulses . In (b), the Fourier amplitudes are encoded in a linear gray scale, with the dark regions representing the high values.

Image of FIG. 6.
FIG. 6.

Fourier analysis of a SEM image (a) of a surface region irradiated by 100 subsequent laser pulses . Note that the Fourier amplitudes in (b) are encoded in the same gray scale used in Fig. 5(b).

Image of FIG. 7.
FIG. 7.

Efficacy factor as a function of the normalized LIPSS wave vector for (a) the direction parallel to the polarization vector and (b) perpendicular to it. In both cases has been calculated for -polarized light according to Eqs. (1)–(14) for normal incident radiation and surface roughness parameters and ). The solid lines represent the results for [, Ref. 18], whereas the dashed lines show the results for [, Ref. 19]. The inset in (a) shows the general geometry of the rough surface irradiated with - or -polarized light (wavelength , wave vector , and angle of incidence ).

Image of FIG. 8.
FIG. 8.

Two-dimensional gray scale map of the efficacy factor for as a function of the normalized LIPSS wave vector (the same parameters as in Fig. 7 have been chosen). High values of are encoded in a linear gray scale with dark colors (range: ). The cross section along the axis with corresponds to the profile given in Fig. 7(a) and the cross section along the axis with corresponds to the profile given in Fig. 7(b).

Image of FIG. 9.
FIG. 9.

Efficacy factor for as a function of the normalized LIPSS wave vector for varying angles of incidence [curves (solid), (dashed), (dotted), (dash-dot), and (dash-dot-dot)] and different polarization orientations. In (a) and (b), is calculated for -polarized radiation, whereas in (c) and (d) it is evaluated for -polarized light. [Parameters: and , , Ref. 18]. Note that the curves in (a) and (c) represent sections along the direction parallel to the projection of the electric-field vector onto the surface, whereas the curves in (b) and (d) show the direction perpendicular to it.

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/content/aip/journal/jap/97/1/10.1063/1.1827919
2004-12-16
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structure formation on the surface of indium phosphide irradiated by femtosecond laser pulses
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/1/10.1063/1.1827919
10.1063/1.1827919
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