Optical properties of femtosecond laser-treated diamond

被引：64
作者：
Calvani, P. [1 ]
Bellucci, A. [1 ,2 ]
Girolami, M. [1 ]
Orlando, S. [3 ]
Valentini, V. [1 ]
Lettino, A. [4 ]
Trucchi, D. M. [1 ]
机构：
[1] CNR, IMIP, Monterotondo Stn, I-00016 Rome, Italy
[2] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy
[3] CNR, IMIP, UOS PZ, I-85050 Tito, PZ, Italy
[4] CNR, IMAA, Inst Methodol Environm Anal, I-85050 Tito, PZ, Italy
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2014年 / 117卷 / 01期
关键词：
SINGLE-CRYSTAL-DIAMOND;
D O I：
10.1007/s00339-014-8311-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A laser-induced periodic surface structure (LIPSS) has been fabricated on polycrystalline diamond by an ultrashort Ti:Sapphire pulsed laser source (lambda = 800 nm, P = 3 mJ, 100 fs) in a high vacuum chamber (< 10(-7) mbar) in order to increase diamond absorption in the visible and infrared wavelength ranges. A horizontally polarized laser beam had been focussed perpendicularly to the diamond surface and diamond target had been moved by an automated X-Y translational stage along the two directions orthogonal to the optical axis. Scanning electron microscopy of samples reveals an LIPSS with a ripple period of about 170 nm, shorter than the laser wavelength. Raman spectra of processed sample do not point out any evident sp (2) content, and diamond peak presents a right shift, indicating a compressive stress. The investigation of optical properties of fs-laser surface textured diamond is reported. Spectral photometry in the range 200/2,000 nm wavelength shows a significant increase of visible and infrared absorption (more than 80 %) compared to untreated specimens (less than 40 %). The analysis of optical characterization data highlights a close relationship between fabricated LIPSS and absorption properties, confirming the optical effectiveness of such a treatment as a light-trapping structure for diamond: these properties, reported for the first time, open the path for new applications of CVD diamond.
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收藏
页码：25 / 29
页数：5
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