Wang Shuhong, Li Futian. Study on Some Characteristics of Planar Holographic Sinusoidal Gratings and Blazed Gratings Used in UV Region in Theory[J]. Editorial Office of Optics and Precision Engineering, 1997,(2): 12-18
Wang Shuhong, Li Futian. Study on Some Characteristics of Planar Holographic Sinusoidal Gratings and Blazed Gratings Used in UV Region in Theory[J]. Editorial Office of Optics and Precision Engineering, 1997,(2): 12-18DOI:
This paper describes the principle of end-point monitoring of the plasma etch and the reactive ion etch for LSI by the optical reflection
and implementation of the optical reflection. The minimum area monitored of 0.3cm
2
and the dynamic monitoring accuracy of less than 80 Å have been obtained by the instrument designed. We compared monitored result of the optical reflection with the emission spectroscopy. Finally the factor influenced on monitoring precsion of the optical reflection is discussed in the paper