An optical waveguide study on the nanopore formation in block copolymer/homopolymer thin films by selective solvent swelling

作者：Kim Dong Ha^*; Lau King Hang Aaron; Joo Wonchul; Peng Juan; Jeong Unyong; Hawker Craig J.; Kim Jin Kon; Russell Thomas P.; Knoll Wolfgang

来源：Journal of Physical Chemistry B, 2006, 110(31): 15381-15388.

DOI：10.1021/jp0630469

• Coupling mode angles
• Microdomains
• Optical modes

Thin films of mixtures of asymmetric poly(styrene-block-methyl methacrylate) (PS-b-PMMA) diblock copolymers and PMMA homopolymers with cylindrical PMMA microdomains oriented normal to the substrate surface were used to couple optical modes in the Kretschmann configuration, and their optical properties were investigated by optical waveguide spectroscopy (OWS). The nanopore formation in the block copolymer (BCP) waveguide layer via selective solvent swelling and subsequent reannealing was monitored in terms of shifts in the coupling mode angles. The sequential swelling/reannealing of the initial mixture film resulted in a number of discrete or partially interconnected pores instead of cylindrical pores with a high aspect ratio. The simultaneous processes occurring inside and on top of the BCP waveguide layer were discerned independently with high selectivity for p- and s-polarization.

• 出版日期2006