Enhancement of Optical Emission and Ion Currents in a Laser Produced Silicon Plasma by Femtosecond Laser-Induced Periodic Surface Structuring

Anoop, K K.; Verma, Nancy; Joy, Nithin; Harilal, Sivanandan S.; Philip, Reji

doi:10.1063/1.5038913

Title: Enhancement of Optical Emission and Ion Currents in a Laser Produced Silicon Plasma by Femtosecond Laser-Induced Periodic Surface Structuring

Journal Article · Fri Jun 01 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5038913· OSTI ID:1545073

Anoop, K K. ^[1]; Verma, Nancy ^[2]; Joy, Nithin ^[2];

^[3]; Philip, Reji ^[2]

Universita degli Studi di Napoli Frederico II
Raman Research Institute
BATTELLE (PACIFIC NW LAB)

Laser-induced periodic surface structuring is a powerful technique for modifying the surface properties of solids. Using ultrashort pulses from a Ti:Sapphire laser (800 nm, 100 fs) we have fabricated nanoscale order laser-induced periodic surface structures (LIPSS) on a silicon (100) surface. The LIPSS patterns are found to be strongly dependent on the laser pulse energy, state of polarization, number of shots delivered on the target, and the ambient pressure. The role of laser wavelength is studied by using the second harmonic output (400 nm) also for fabrication. Large area (5x4 mm2) surface structuring has been carried out at atmospheric pressure after optimizing the laser parameters at 800 nm. The patterned silicon surface shows a substantial reduction in the reflection of incident light over a wide range of wavelengths, in comparison to plain silicon. Moreover, when used for laser induced breakdown spectroscopy (LIBS) experiments, enhanced optical emission and ion current have been observed from the patterned surface. This indicates that coupling of laser energy to the surface is enhanced in the case of patterned silicon. While spectral lines emitted by doubly ionized silicon have been observed from the patterned surface, the plain surface gives lines from singly ionized silicon only. A discernible enhancement has been measured in both optical (50-90%) and electrical (34%) signals from the plasma generated on the patterned surface. These results confirm that LIPSS is a versatile method for enhancing the coupling of laser energy on to irradiated solid surfaces.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1545073

Report Number(s):: PNNL-SA-135428

Journal Information:: Physics of Plasmas, Vol. 25, Issue 6

Country of Publication:: United States

Language:: English

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ion currents
optical emission
laser produced silicon plasma
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femtosecond laser-induced periodic surface structuring

Title: Enhancement of Optical Emission and Ion Currents in a Laser Produced Silicon Plasma by Femtosecond Laser-Induced Periodic Surface Structuring

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