tailieunhanh - Báo cáo hóa học: "Single-photon Transistors Based on the Interaction of an Emitter and Surface Plasmons"

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 .