Ultrafast nonlinear optical response of squarylium dye J-aggregates spincoated films and an application to T bps demultiplexer

We have fabricated spincoated film of squarylium dye (SQ) J-aggregates exhibiting ultrafast nonlinear optical response at room temperature and shown a new serial-to-parallel demultiplexer for T bps optical signals using SQJ-aggregates film Optical dynamics measurements reveal that saturable absorption of this SQJ-spincoated film exhibits a decay time of less than 100 fs at pump energy of 80 fJ/mu m(2). With this ultrafast SQJ optical film, multi-output demultiplexing operations for T bps optical signals were demonstrated. A series of 4 pulses with 100 fs duration and 1 ps interval (corresponding to 1 T bps signals) were irradiated onto the SQJ film synchronized with a 100 fs gate pulse at a finite angle. Four demultiplexed signals were clearly observed at different areas on CCD camera. (C) 2001 Elsevier Science B.V. All rights reserved.