Phases and Third-Order Optical Nonlinearities in Tetravalent Metallophthalocyanine Thin Films

Abstract

The third-order optical susceptibilities χ 1111 (3) (-3ω; ω, ω, ω) s f o r t w o d i f f e r e n t p h a s e s i n v a n a d y l a n d t i t a n y l p h t h a l o c y a n i n e ( V O P c a n d T i O P c ) v a c u u m - d e p o s i t e d t h i n f i l m s a r e d e t e r m i n e d b y o p t i c a l t h i r d - h a r m o n i c g e n e r a t i o n ( T H G ) m e a s u r e m e n t s a t w a v e l e n g t h s 1543 n m a n d 1907 n m . T h e r m a l a n n e a l i n g c a u s e s a p h a s e t r a n s i t i o n w h i c