title: Spectrally-Narrowed Emissions from Organic Crystals Having a One-Dimensional Grating on Their Surface.
abstract: We have succeeded in directly engraving one-dimensional diffraction gratings on the surface of organic semiconducting oligomer crystals by using focused ion beam (FIB) lithography and laser ablation (LA) methods. The FIB method enabled us to shape the gratings with varying periods down to ~150 nm. With the LA method a large-area grating with a ~500-nm period was readily accessible. All the above crystals indicated spectrally-narrowed emission (SNE) lines even in the case of shallow groove depths ~2-4 nm. In particular, we definitively observed the SNE pertinent to the first-order diffraction with the crystal having the diffraction grating of a 148.3-nm average period. The present results indicate utility of the built-in gratings that can directly be fabricated on the surface of the crystals.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamamoto
authors.forename: Keiji
authors.initials: K
authors.lastname: Obara
authors.forename: Shohei
authors.initials: S
authors.lastname: Higashihara
authors.forename: Yuki
authors.initials: Y
authors.lastname: Obama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yamao
authors.forename: Shu
authors.initials: S
authors.lastname: Hotta