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Title: Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

Graphene-doped polymer nanofibers are fabricated by taper drawing of solvated polyvinyl alcohol doped with liquid-phase exfoliated graphene flakes. Nanofibers drawn this way typically have diameters measured in hundreds of nanometers and lengths in tens of millimeters; they show excellent uniformity and surface smoothness for optical waveguiding. Owing to their tightly confined waveguiding behavior, light–matter interaction in these subwavelength-diameter nanofibers is significantly enhanced. Using approximately 1350-nm-wavelength femto-second pulses, we demonstrate saturable absorption behavior in these nanofibers with a saturation threshold down to 0.25 pJ pulse-1 (peak power ~1.3 W). Additionally, using 1064-nm-wavelength nanosecond pulses as switching light, we show all-optical modulation of a 1550-nm-wavelength signal light guided along a single nanofiber with a switching peak power of ~3.2 W.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Zhejiang Univ., Hangzhou (China)
  2. Fudan Univ., Shanghai (China)
  3. Univ. of California, Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
1239550
Grant/Contract Number:
AC03-76SF00098
Type:
Accepted Manuscript
Journal Name:
Light, Science & Applications
Additional Journal Information:
Journal Volume: 4; Journal ID: ISSN 2047-7538
Publisher:
Nature Publishing Group
Research Org:
Univ. of California, Berkeley, CA (United States). Department of Physics
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY graphene; nanofiber; optical modulation; saturable absorption