Two-photon absorption in quadrupolar bis(acceptor)-terminated chromophores with electron-rich bis(heterocycle)vinylene bridges

Shijun Zheng, Amalia Leclercq, Jie Fu, Luca Beverina, Lazaro A. Padilha, Egbert Zojer, Karin Schmidt, Stephen Barlow, Jingdong Luo, Sei Hum Jiang, Alex K.Y. Jen, Yuanping Yi, Zhigang Shuai, Eric W. Van Stryland, David J. Hagan, Jean Luc Brédas, Seth R. Marder^*