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Absorptive structures fabricated by laser writing

X-F LI1,2, , S O’BRIEN3, R. J. WINFIELD3

Affiliation

  1. Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
  2. Department of Microelectronic Engineering, University College Cork, Cork, Ireland
  3. Tyndall National Institute, Lee Maltings, Prospect Row, Cork Ireland

Abstract

The spectral properties of metallic surfaces are of much interest in applications such as solar absorption. These may help improve the performance of solar thermal systems and solar cells. The fabrication of periodic metallic features on the device surface is known to increase absorption and the use of diffractive structures has been reported. In this paper we report use of corrugated metal structures formed by a novel approach. Two photon polymerisation is used to write a 2D grid pattern, with a pitch of either 2 or 3 microns, onto which a chrome metal layer was evaporated. A Ti:sapphire laser, with wavelength 795 nm, 80MHz repetition rate, 100 fs pulse duration and an average power of 700 mW, was used to write the grid in a Zrloaded sol-gel. The measured reflection and transmission properties show that the absorption increases in a part of the spectrum that can be related to the structure’s dimensions. A RCWA code was used to define the optimal parameters for solar absorption in this system..

Keywords

Solar selective absorber, Laser, Surface grating, Microstructure.

Submitted at: June 14, 2009
Accepted at: Feb. 27, 2010

Citation

X-F LI, , S O’BRIEN, R. J. WINFIELD, Absorptive structures fabricated by laser writing, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 595-598 (2010)