Ultrafast nonlinear absorption and reflection of ZnS/ZnSe periodic nanostructures

✍ Scribed by M.V. Ermolenko; S.A. Tikhomirov; V.V. Stankevich; O.V. Buganov; S.V. Gaponenko; P.I. Kuznetsov; G.G. Yakushcheva

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 438 KB
• Volume: 5
• Category: Article
• ISSN: 1569-4410
• DOI: 10.1016/j.photonics.2007.04.002

✦ Synopsis

ZnS/ZnSe heterostructures under condition of ZnSe interband excitation by a 150 fs laser pulse exhibit strong narrow-band modification of absorption and wide-band modification of reflection. Mean decay time for nonlinear reflection in heterostructures ranges from 2 to 3 ps whereas in bare ZnSe monolayer it exceeds 5 ps. Possible physical processes responsible for nonlinear refraction in the transparency region include interplay of absorption driven nonlinear refraction via Kramers-Kronig relations and intrinsic dielectric properties of dense electron-hole plasma. For nonlinear absorption at ZnSe band edge, interplay of plasma screening effects and states filling effects are relevant.