Page 1. ► Cover image from MP Rao, MF Aimi, and NC MacDonald, Appl. Phys. Lett. 85, 6281 (2004) ANNOUNCEMENTS vii New Citation Format LASERS, OPTICS, AND OPTOELECTRONICS 6083 Persistent photocurrent spectroscopy of GaN metal–semiconductor–metal photodetectors on long time scale B. Potì, A. Passaseo, M. Lomascolo, R. Cingolani, M. De Vittorio 6086 Application of modified transmission line model to measure p-type GaN contact NC Chen, CY Tseng, AP Chiu, CF Shih, PH Chang 6089 Properties of defect modes in one-dimensional photonic crystals containing a defect layer with a negative refractive index Kun-yuan Xu, Xiguang Zheng, Wei-long She 6092 Direct optoelectronic generation and detection of sub-ps-electrical pulses on sub-mm-coaxial transmission lines Tae-In Jeon, D. Grischkowsky …