Giant Intrinsic Circular Dichroism of Prolinol-derived Squaraine Thin Films

Overview

Journal Nat Commun

Specialty Biology

Date 2018 Jun 22

PMID 29925832

Citations 18

Authors

Matthias Schulz

Jennifer Zablocki

Oliya S Abdullaeva

Stefanie Bruck

Frank Balzer

Arne Lutzen

Oriol Arteaga

Manuela Schiek

Affiliations

Soon will be listed here.

Abstract

Molecular chirality and the inherently connected differential absorption of circular polarized light (CD) combined with semiconducting properties offers great potential for chiral opto-electronics. Here we discuss the temperature-controlled assembly of enantiopure prolinol functionalized squaraines with opposite handedness into intrinsically circular dichroic, molecular J-aggregates in spincasted thin films. By Mueller matrix spectroscopy we accurately probe an extraordinary high excitonic circular dichroism, which is not amplified by mesoscopic ordering effects. At maximum, CD values of 1000 mdeg/nm are reached and, after accounting for reflection losses related to the thin film nature, we obtain a film thickness independent dissymmetry factor g = 0.75. The large oscillator strength of the corresponding absorption within the deep-red spectral range translates into a negative real part of the dielectric function in the spectral vicinity of the exciton resonance. Thereby, we provide a new small molecular benchmark material for the development of organic thin film based chiroptics.

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