Kniha Sensitivity Analysis for Grating Reconstruction Nico van der Aa

Sensitivity Analysis for Grating Reconstruction

Finding Analytical Field Amplitude Derivatives by Using RCWA

Jazyk: Angličtina
Väzba: Brožovaná
Vydavateľ: VDM Verlag
Dostupnosť: U vydavateľa na objednávku
Odosielame za 17-27 dní
58.07
Periodic structures, called diffraction gratings, play an important role in optical lithography. Whe...

Informácie o knihe

Jazyk
Angličtina
Väzba
Kniha - Brožovaná
Vydalo
2008
Stránok
148
EAN
9783639019452
ISBN
3639019458
Enbook ID
06811851
Vydavateľ
Hmotnosť
209
Rozmery
152 x 229 x 8

Kompletný popis

Periodic structures, called diffraction gratings, play an important role in optical lithography. When the incident field and the shape of a grating is known, the diffracted field can be computed by using the rigorous coupled-wave analysis (RCWA) or the C method. These so-called forward models solve Maxwell's equations for time-harmonic fields by transforming them into algebraic eigensystems.§§The reconstruction of a grating shape starts with an initial guess of its shape. The diffracted field is computed with the forward model and compared to actual measurements. The difference between them determines how the shape parameters should be adjusted. This will be repeated iteratively until an optimal solution has been found.§§The focus of this work lies in finding the first-order derivatives of the diffracted field with respect to the physical parameters. This can be done by finite differences, but straightforward differentiation of the relations within RCWA gives a more accurate and faster way to find these derivatives. Periodic structures, called diffraction gratings, §play an important role in optical lithography. When §the incident field and the shape of a grating is §known, the diffracted field can be computed by using §the rigorous coupled-wave analysis (RCWA) or the C §method. These so-called forward models solve §Maxwell''s equations for time-harmonic fields by §transforming them into algebraic eigensystems.§The reconstruction of a grating shape starts with an §initial guess of its shape. The diffracted field is §computed with the forward model and compared to §actual measurements. The difference between them §determines how the shape parameters should be §adjusted. This will be repeated iteratively until an §optimal solution has been found.§The focus of this work lies in finding the first-§order derivatives of the diffracted field with §respect to the physical parameters. This can be done §by finite differences, but straightforward §differentiation of the relations within RCWA gives a §more accurate and faster way to find these §derivatives.

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