• Nonlinear Optical Signatures of Transition from Semiconductor to Semimetal in PtSe2 

      Wang, Lei; Zhang, Saifeng; McEvoy, Niall; Sun, Yi-yang; Huang, Jiawei; Xie, Yafeng; Dong, Ningning; Zhang, Xiaoyan; Kislyakov, Ivan M.; Nunzi, Jean-Michel; Zhang, Long; Wang, Jun (Wiley, 2019-07-08)
      The demand for an ultrabroad optical material with a bandgap tunable from zero to at least 1~2 eV has been one of the driving forces for exploring new two-dimensional (2D) materials since the emergence of graphene, transition ...
    • Photonic crystal based broadband graphene saturable absorber 

      Zhang, Saifeng; Shen, Caoran; Kislyakov, Ivan M.; Dong, Ningning; Ryzhov, Anton; Zhang, Xiaoyan; Belousova, Inna M.; Nunzi, Jean-Michel; Wang, Jun (OSA Publishing, 2019-10-01)
      The enhanced saturable absorption (SA) of a one- dimensional (1D) photonic crystal (PC) made from polymers and graphene composites by spin-coating is observed. It shows obvious bandgaps at two wavelengths in transmittance. ...
    • Two-photon absorption towards pulse modulation in mechanically exfoliated and CVD monolayer cascaded MoS2 structures 

      Xie, Yafeng; Zhang, Saifeng; Zhang, Xiaoyan; Dong, Ningning; Kislyakov, Ivan M.; Luo, Song; Chen, Zhanghai; Nunzi, Jean-Michel; Zhang, Long; Wang, Jun (Chinese Optics Letters, 2019-07-16)
      Mechanical exfoliation (ME) and chemical vapor deposition (CVD) MoS2 monolayers have been extensively studied, but the large differences of nonlinear optical performance between them have never been clarified. Here, we ...