With controlling the femtosecond (fs) laser polarization and scanning direction
the regular distribution of composite micro/nano structures was induced on the surfaces of silicon and stainless steel by Orthogonal Line Scanning Processing (OLSP). The influence of laser fluence on the micro/nano structures was studied. The experimental results show that two-dimensional (2D) composite structures nested with periodic ripples and nanoholes are induced on the silicon wafer surface
however
nanorod arrays at the edge of scanning area are induced on the stainless steel surface when the laser fluence is close to the material ablation threshold. The analysis indicates that the nanorod arrays are formed by the fracture of periodic ripples. Moreover
when laser fluence is higher than the ablation threshold
the regular distribution of micro hole structures is induced both on the surfaces of silicon and stainless steel. The experimental results demonstrate that the micro/nano structures induced by the first line scanning enhances its laser absorption and promotes the coupling between the incident fs laser and the surface plasma wave
so that the ablation of the second scanning is enhanced and the later structures induced by the second scanning becomes a dominating. In conclusion
the OLSP provides a new approach for fabrication of surface micro/nano structures.
QIAO H ZH, WANG F, ZHANG N, et al.. Femtosecond laser fabrication of two-dimensional periodic composite structures on tungsten surface[J]. Chinese Journal of Lasers, 2017, 44(1):0102010. (in Chinese)
YAO J W, ZHANG CH Y, LIU H Y, et al.. High spatial frequency periodic structures induced on metal surface by femtosecond laser pulses[J]. Optics Express, 2012, 20(2):905-911.
LI X F, ZHANG CH Y, LI H, et al.. Formation of 100-nm periodic structures on a titanium surface by exploiting the oxidation and third harmonic generation induced by femtosecond laser pulses[J]. Optics Express, 2014, 22(23):28086-28099.
ZHANG CH Y, YAO J W, LIU H Y, et al.. Colorizing silicon surface with regular nanohole arrays induced by femtosecond laser pulses[J]. Optics Letters, 2012, 37(6):1106-1108.
HER T H, FINLAY R J, WU C, et al.. Microstructuring of silicon with femtosecond laser pulses[J]. Applied Physics Letters, 1998, 73(12):1673-1675.
HUANG Y Y, QIAN J, SHAO CH Y, et al.. Femtosecond laser induced defects in pure silica glass with different hydroxyl concentrations[J]. Chinese Journal of Lasers, 2017, 44(1):102011. (in Chinese)
SHEN M Y, CROUCH C H, CAREY J E, et al.. Femtosecond laser-induced formation of submicrometer spikes on silicon in water[J]. Applied Physics Letters, 2004, 85(23):5694-5696.
VOROBYEV A Y, GUO CH L. Laser turns silicon superwicking[J]. Optics Express, 2010, 18(7):6455-6460.
QI L T, NISHⅡ K, NAMBA Y. Regular subwavelength surface structures induced by femtosecond laser pulses on stainless steel[J]. Optics Letters, 2009, 34(12):1846-1848.
DUFFT D, ROSENFELD A, DAS S K, et al.. Femtosecond laser-induced periodic surface structures revisited:a comparative study on ZnO[J]. Journal of Applied Physics, 2009, 105(3):034908.
BOROWIEC A, HAUGEN H K. Subwavelength ripple formation on the surfaces of compound semiconductors irradiated with femtosecond laser pulses[J]. Applied Physics Letters, 2003, 82(25):4462-4464.
JIA X, JIA T Q, ZHANG Y, et al.. Periodic nanoripples in the surface and subsurface layers in ZnO irradiated by femtosecond laser pulses[J]. Optics Letters, 2010, 35(8):1248-1250.
LE HARZIC R, SCHUCK H, SAUER D, et al.. Sub-100 nm nanostructuring of silicon by ultrashort laser pulses[J]. Optics Express, 2005, 13(17):6651-6656.
HUANG M, ZHAO F L, CHENG Y, et al.. Origin of laser-induced near-subwavelength ripples:interference between surface plasmons and incident laser[J]. ACS Nano, 2009, 3(12):4062-4070.
LE HARZIC R, DÖRR D, SAUER D, et al.. Generation of high spatial frequency ripples on silicon under ultrashort laser pulses irradiation[J]. Applied Physics Letters, 2011, 98(21):211905.
JIA T Q, CHEN H X, HUANG M, et al.. Formation of nanogratings on the surface of a ZnSe crystal irradiated by femtosecond laser pulses[J]. Physical Review B, 2005, 72(12):125429.
ZHANG CH Y, YAO J W, LAN SH, et al.. Effects of plasma confinement on the femtosecond laser ablation of silicon[J]. Optics Communications, 2013, 308:54-63.
YU J, HE SH T, SONG H Y, et al.. Metal nanostructured film generated by femtosecond laser induced forward transfer[J]. Chinese Journal of Lasers, 2017, 44(1):102009. (in Chinese)
YANG Y, YANG J J, XUE L, et al.. Surface patterning on periodicity of femtosecond laser-induced ripples[J]. Applied Physics Letters, 2010, 97(14):141101.
GUAY J M, LESINA A C, C T G, et al.. Laser-induced plasmonic colours on metals[J]. Nature Communication, 2017, 8:16095.
HUANG M, ZHAO F L, CHENG Y, et al.. Origin of laser-induced near-subwavelength ripples:interference between surface plasmons and incident laser[J]. ACS Nano, 2009, 3(12):4062-4070.
BONSE J, ROSENFELD A, KRVGER J. Implications of transient changes of optical and surface properties of solids during femtosecond laser pulse irradiation to the formation of laser-induced periodic surface structures[J]. Applied Surface Science, 2011, 257(12):5420-5423.