  The inscription of Bragg gratings in chalcogenide (As2Se3) wires with
sub-wavelength diameter is proposed and demonstrated. A modified transverse
holographic method employing He Ne laser light at a wavelength of {\lambda}w =
633 nm allows the writing of Bragg grating reflectors in the 1550 nm band. The
gratings reach an extinction ratio of 40 dB in transmission and a negative
photo-induced index change of \delta n~0.01. The inscription of Bragg gratings
in chalcogenide microwires will enable the fabrication of new devices with
applications in nonlinear optics, and sensing in the near-to-mid-infrared
region of wavelengths.
