Seminar: "Microfiber coupled low-dimensional structures for nanophotonic devices" by Prof. Tong

Date

2016年12月16日 (金) 11:00 12:00

Location

C700, Lab3 Level C

Description

Title:"Microfiber coupled low-dimensional structures for nanophotonic devices"

Speaker: Professor Limin Tong

Affiliation: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China

 

Abstract:

Optical microfibers or nanofibers, with diameter close to the wavelength of the waveguided light, leaving a considerably large fractional evanescent fields for coupling low-dimensional functional materials on the surface. Here I introduce our recent progress on microfiber-coupled structures for photonic devices: First, by coating graphene films on a microfiber, and enhancing light-graphene interaction with confined waveguiding modes of the microfiber, we show an all-optical ultrafast graphene modulator with response time down to 2 ps at 1550-nm wavelength. Secondly, by counterpropagating ultrafast pulses in a CdTe nanowire evanescently coupled to microfibers at both ends, and converting the temporal profile of the pulses into the transverse second harmonic spatial image, we demonstrate a single-nanowire optical correlator for femtosecond pulses with energy down to 2 fJ/pulse at 1064-nm wavelength. Finally, by coupling a single Au nanorod with whispering gallery cavity of a microfiber and introducing strong-coupling-induced mode splitting, we show the possibility of squeezing the plasmonic resonance band of the nanorod from 50 nm to 2 nm. Our results suggest that the microfiber is a versatile platform for nanophotonic devices and applications.

References

[1]   W. Li et al., "Ultrafast all-optical graphene modulator," Nano Lett. 14, 955-959 (2014).

[2]  S. L. Yu et al., "All-optical graphene modulator based on optical Kerr phase shift," Optica 3, 541-544 (2016).

[3]   C. G. Xin et al., "Single CdTe nanowire optical correlator for femtojoule pulses," Nano Lett. 16, 4807-4810 (2016).

[4] P. Wang et al., "Single-band 2-nm-linewidth plasmon resonance in a strongly coupled Au nanorod," Nano Lett. 15, 7581-7586 (2015).

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