Optical Second-Harmonic Generation from an Au Wedge on Si(111)

✍ Scribed by Kristensen, Th. B. ;Pedersen, K. ;Pedersen, Th. G.

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 186 KB
• Volume: 175
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/(sici)1521-396x(199909)175:1<195::aid-pssa195>3.0.co;2-6

✦ Synopsis

Recently, in situ optical second-harmonic generation (SHG) monitoring the growth of noble metal films on Si(111) has revealed clear oscillations in the second-harmonic (SH) signal with film thickness suggesting the presence of discrete quantum well states (QWS). In order to extend these studies to measurements of the SH signal versus film thickness under various experimental conditions (e.g. different wavelengths and angles of incidence) a wedge-shaped Au film deposited on a Si(111) ( 3 p  3 p ) : Au reconstructed surface has been produced. The thickness variation along the wedge is calibrated by comparison with SHG measurements made during film growth and by performing a linear reflectance scan. Spectroscopic SHG studies of the wedge reveal several resonances in accordance with formation of QWS. Microscopic calculations of the SH response of a quantum well structure support these results.