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Order-sorting filters for a grating spectrometer and multichannel detection system: application to real-time spectroscopic ellipsometry
- Source :
- Analytical Chemistry. April 1, 1998, Vol. 70 Issue 7, p1346, 6 p.
- Publication Year :
- 1998
-
Abstract
- A multichannel detection system with a grating spectrometer was employed for rapid spectroscopic ellipsometry measurements. Although a grating spectrometer is convenient for dispersing light, it suffers from overlapping orders. Here, we developed novel techniques to eliminate overlapping orders of spectra from a reflection grating. First, an optical filter is properly positioned in the measurement system. Second, a numerical filter is developed. A monochromatic source was used to deduce the exact amount of the overlapping orders, which were determined as the irradiance ratio of the second- to the first-order diffraction. The ratios were found to be increased from 5 to 11% in the 1.5-2.5 eV region. We used the values to correct for overlapping irradiance using the numerical filter. Finally, second-order reflection in real-time rotating element spectroellipsograms were corrected using the filters developed in this work.
- Subjects :
- Diffraction gratings -- Usage
Spectrum analysis -- Usage
Chemistry
Subjects
Details
- ISSN :
- 00032700
- Volume :
- 70
- Issue :
- 7
- Database :
- Gale General OneFile
- Journal :
- Analytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.20740526