Optics: measuring and testing – Shape or surface configuration – By specular reflection
Reexamination Certificate
2011-08-02
2011-08-02
Chowdhury, Tarifur R. (Department: 2886)
Optics: measuring and testing
Shape or surface configuration
By specular reflection
C356S601000, C356S625000, C356S138000, C356S073000, C702S082000, C718S104000
Reexamination Certificate
active
07990549
ABSTRACT:
An optical metrology apparatus for measuring periodic structures using multiple incident azimuthal (phi) and polar (theta) incident angles is described. One embodiment provides the enhanced calculation speed for the special case of phi=90 incidence for 1-D (line and space) structures, which has the incident plane parallel to the grating lines, as opposed to the phi=0 classical mounting, which has incident plane perpendicular to the grating lines. The enhancement reduces the computation time of the phi=90 case to the same order as the corresponding phi=0 case, and in some cases the phi=90 case can be significantly faster. One advantageous configuration consists of two measurements for each sample structure, one perpendicular to the grating lines and one parallel. This provides additional information about the structure, equivalent to two simultaneous angles of incidence, without excessive increase in computation time. Alternately, in cases where the computation for phi=90 is faster than the corresponding phi=0 incidence, it may be advantageous to measure parallel to the grating lines only. In the case where two sets of incident angles are used, the incident light can be polarized to provide a total of four sets of data—Rs0, Rp0, Rs90, Rp90—for each incident polar angle, all from the same structure.
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Akanbi Isiaka O
Chowdhury Tarifur R.
D. Kligler I.P. Services Ltd.
Jordan Valley Semiconductors Ltd.
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