Back to Search
Start Over
Spectroscopic ellipsometry analysis of silicon nanotips obtained by electron cyclotron resonance plasma etching
Spectroscopic ellipsometry analysis of silicon nanotips obtained by electron cyclotron resonance plasma etching
- Source :
- Applied Optics. Sept 10, 2009, Vol. 48 Issue 26, p4996, 9 p.
- Publication Year :
- 2009
-
Abstract
- Silicon nanotips fabricated by electron cyclotron resonance plasma etching of silicon wafers are studied by spectroscopic ellipsometry. The structure of the nanotips is composed of columns 100-140 nm wide and spaced by about 200 nm. Ellipsometry data covering a wide spectral range from the midinfrared to the visible are described by modeling the nanotip layer as a graded uniaxial film using the Bruggeman effective medium approximation. The ellipsometry data in the infrared range reveal two absorption bands at 754 and 955 cm-1, which cannot be resolved with transmittance measurements. These bands indicate that the etching process is accompanied with formation of carbonaceous SiC and CHn species that largely modify the composition of the original crystalline silicon material affecting the optical response of the nanotips. OCIS codes: 120.2130, 160.1245, 260.2065, 310.3840.
Details
- Language :
- English
- ISSN :
- 1559128X
- Volume :
- 48
- Issue :
- 26
- Database :
- Gale General OneFile
- Journal :
- Applied Optics
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.210223187