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18.01.2019

IMN-Sonderkolloquium: "Excitonic Soft Matter - Light Interactions and Their Application in Polaritonic & Chiroptical Devices"

Am Freitag, dem 18.01.2019, um 10 Uhr spricht Jun.-Prof. Dr. Manuela Schick von der Universität Oldenburg, Institut für Physik,im Rahmen des IMN-Kolloquiums zum Thema "Excitonic Soft Matter - Light Interactions and Their Application in Polaritonic & Chiroptical Devices". Die Veranstaltung findet im Feynmanbau, Gustav-Kirchhoff-Straße 7, Raum 114/115, statt.

Zum Vortrag:
Organic semiconductors are soft in the sense of mechanical flexibility and chemical tunability but strong in their interactions with light, eventually showing a quasi-metallic response. Chemical modifications on the molecular level are setscrews to target the molecular packing and consequently tuning the structure-correlated excitonic thin film properties. If extended molecular H- and J-aggregates are formed, their optical eigenstates can be localized by polarized spectro- microscopy mapping. When inserted into a resonant optical micro-cavity new hybrid light-matter states are formed allowing further, non-chemical tuning of the opto-electronic properties. With that, e.g., polaritonic sub-bandgap photodetectors become possible. Upon structural mirror symmetry breaking in the molecular aggregates, a hallmark of the living world, the material absorbs left and right handed circular polarized light to a different extent. This circular dichroic response can be greatly amplified in supra-molecular aggregated thin films due to the nature of its excitonic coupling. For an accurate quantification of the circular dichroism Mueller matrix ellipsometry is utilized. Here, circular dichroic bulk-heterojunction blends inserted into conventional photodiodes are presented, showing a handedness-dependent photocurrent response without the need for additional polarization manipulating optical elements.

Gäste sind herzlich willkommen.

Weitere Vorträge im Wintersemester 2018/2019