Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Single-photon Transistors Based on the Interaction of an Emitter and Surface Plasmons | Nanoscale Res Lett 2008 3 361-364 DOI s11671-008-9166-9 NANO EXPRESS Single-photon Transistors Based on the Interaction of an Emitter and Surface Plasmons Fang-Yu Hong Shi-Jie Xiong Received 21 June 2008 Accepted 25 August 2008 Published online 19 September 2008 to the authors 2008 Abstract A symmetrical approach is suggested Chang DE et al. Nat Phys 3 807 2007 to realize a single-photon transistor where the presence or absence of a single incident photon in a gate field is sufficient to allow prevent the propagation of a subsequent signal photon along the nanowire on condition that the gate field is symmetrically incident from both sides of an emitter simultaneously. We present a scheme for single-photon transistors based on the strong emitter-surface-plasmon interaction. In this scheme coherent absorption of an incoming gate photon incident along a nanotip by an emitter located near the tip of the nanotip results in a state flip in the emitter which controls the subsequent propagation of a signal photon in a nanowire perpendicular to the axis of the nanotip. Keywords Single-photon transistor Nanotip Surface plasmon Introduction The fundamental limit of a photonic transistor 1 is a single-photon transistor where the propagation of a single photon in the signal field is controlled by the presence or absence of a single photon in the gate field. Such a nonlinear device may find many interesting applications in fields such as optical communication 2 optical quantum computer 3 and quantum-information processing 4 . However its physical realization is extremely demanding . Hong H . Xiong National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China e-mail honghfy@ because photons rarely interact. To achieve strong interaction between photons several schemes based on either the resonantly enhanced nonlinearities of atomic ensembles 5-8 or individual atoms coupled to photons in cavity quantum .
