Self-Assembly of a Carboxyl -Bipyridinium Zwitterion into a High-Performance Photoswitchable NLO Crystal
Efficient photoswitchable second-order nonlinear optical (NLO) materials are highly attractive for optical signal processing. However, achieving high-performance switching in molecular crystals remains challenging, requiring simultaneous optimization of response speed (<120 s saturation), modulation depth (∼90%), and...