title: Formation of in-volume nanogratings with sub-100-nm periods in glass by femtosecond laser irradiation.
abstract: We present direct experimental observation of the morphological evolution during the formation of nanogratings with sub-100-nm periods with the increasing number of pulses. Theoretical simulation shows that the constructive interference of the scattering light from original nanoplanes will create an intensity maximum located between the two adjacent nanoplanes, resulting in shortening the nanograting period by half. The proposed mechanism explains the formation of nanogratings with periods beyond those predicted by the nanoplasmonic model.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liao
authors.forename: Wangjun
authors.initials: W
authors.lastname: Pan
authors.forename: Yun
authors.initials: Y
authors.lastname: Cui
authors.forename: Lingling
authors.initials: L
authors.lastname: Qiao
authors.forename: Yves
authors.initials: Y
authors.lastname: Bellouard
authors.forename: Koji
authors.initials: K
authors.lastname: Sugioka
authors.forename: Ya
authors.initials: Y
authors.lastname: Cheng