Ultrafast Laser Induced Subwavelength Periodic Surface Structures on Semiconductors/Metals and Application to SERS Studi
- PDF / 1,958,366 Bytes
- 12 Pages / 612 x 792 pts (letter) Page_size
- 40 Downloads / 180 Views
Advances:
Email alerts: Click here Subscriptions: Click here Commercial reprints: Click here Terms of use : Click here
Ultrafast Laser Induced Subwavelength Periodic Surface Structures on Semiconductors/Metals and Application to SERS Studies V. Saikiran, Mudasir H Dar, R. Kuladeep and Narayana Rao Desai MRS Advances / FirstView Article / July 2016, pp 1 - 11 DOI: 10.1557/adv.2016.468, Published online: 23 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004680 How to cite this article: V. Saikiran, Mudasir H Dar, R. Kuladeep and Narayana Rao Desai Ultrafast Laser Induced Subwavelength Periodic Surface Structures on Semiconductors/Metals and Application to SERS Studies. MRS Advances, Available on CJO 2016 doi:10.1557/ adv.2016.468 Request Permissions : Click here
Downloaded from http://journals.cambridge.org/ADV, IP address: 128.210.126.199 on 05 Jul 2016
MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.468
Ultrafast Laser Induced Subwavelength Periodic Surface Structures on Semiconductors/Metals and Application to SERS Studies Saikiran V., Mudasir H Dar, Kuladeep R., Narayana Rao Desai* School of Physics, University of Hyderabad, Hyderabad, India, 500046. *
Email: [email protected] & [email protected] (D N R)
ABSTRACT In this manuscript a simple approach is discussed to fabricate uniform periodic surface structures on semiconductor surfaces by femtosecond laser irradiation for surface-enhanced Raman spectroscopy (SERS) applications. Gold films having different thickness are first deposited on semiconductor silicon (Si) surfaces and then periodic surface structures are fabricated by femtosecond laser irradiation. The periodic structures are observed to be uniform over a large area with chain type structure formation of gold and Si. We have studied the formation of these surface structures on Si surface by having different thickness gold films deposited on Si substrates. This approach of the fabrication of surface structures with the assistance of gold film is found to help in local field enhancement and hence work as suitable substrate for the SERS experiments. The conditions for achieving high enhancement factor in SERS with different gold film thicknesses are explored in detail. We also present here the formation of low frequency ripples on Silicon (Si) and high frequency as well as low frequency ripples on titanium (Ti) surface in air and water environments by irradiation with fs laser pulses. Different morphologies were observed on Ti surface depending upon the laser irradiation parameters and the surrounding dielectric medium. INTRODUCTION Nanofabrication techniques that yield well-defined structures much smaller than the wavelength of the visible light and the techniques that can facilitate the production of features smaller than the diffraction limit are in great demand owing to their applications in electro-optic devices [1-3]. These techniques help in the fabrication of interesting nanostructures for applications in optoelectronic
Data Loading...
