Fig. 4. Design and realization of SPDT optical switch based on the asymmetric photon transport.
(A and B) Configurations of a dual-output device in the absence (A) and presence (B) of an electric field. Insets: Photoluminescence images of a wire with α = 45°. The two tips (marked with white circles) are monitored as the output ports O1 and O2. WG, waveguide. (C) Outcoupled spectra of O1 and O2 under different field strengths ranging from 0 to 1.0 × 106 V/m. Insets: Linear fits of the outcoupling modulation from ports O1 and O2 versus the electric field strength. (D) Schematic illustration of the SPDT optical switches that can be controlled by operating the electric field. (E) Cyclic on/off switching behavior, which is changed by repeatedly altering the direction of electric field. (F) Series of light pulses with response time of 4.2 ns generated by electrical pulses with a rise time of 3.8 ns. (G) Temporal intensity profiles of O1 and O2 with 10-MHz electrical pulses.