St. Petersburg Polytechnic University Journal: Physics and Mathematics Научно-технические ведомости СПбГПУ. Физико-математические науки 2304-9782, 2618-8686, 2405-7223 21 10.18721/JPM.153.221 Phase-change periodic surface structures for engineering of excitonic photoluminescence in WS2 monolayers Индуцированные лазером периодические поверхностные структуры с модуляцией фазового состояния для управления экситонной фотолюминесценцией монослоев WS2 Trofimov Pavel p.trofimov@metalab.ifmo.ru Ivanova Tatyana tatyana.ivanova@metalab.ifmo.ru Lazarenko Petr aka.jum@gmail.com Fedyanina Maria mfh.miet@gmail.com Sinev Ivan i.sinev@metalab.ifmo.ru 01 12 2022 15 3.2 113 117

Due to their two-dimensional nature, transition metal dichalcogenide monolayers exhibit extremely strong sensitivity of their excitonic response to the permittivity of the surrounding medium. Here, we show that the intensity and wavelength of their excitonic photoluminescence can be spatially modulated by periodic structures induced by laser pulses in phase change material films.

 phase change materials Ge2Sb2Te5 transition metal dichalcogenides WS2 laser induced periodic surface structures phase change gratings exciton screening