Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 52, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202006236
Keywords
cholesteric liquid crystal network; circularly polarized light; encryption; near-infrared organic photodetector; physically unclonable function
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Funding
- Young Fellow Program of Korea Institute of Science and Technology (KIST) [2V07910]
- Future Resource Research Program of Korea Institute of Science and Technology (KIST) [2E30420]
- National Research Foundation of Korea (NRF) grant - Korea government, Ministry of Science and ICT (MSIT) [2019R1C1C1006048, 2019M3D1A2103918, 2017R1E1A1A01077484]
- National Research Foundation of Korea [2019R1C1C1006048, 2019M3D1A2103918, 2017R1E1A1A01077484] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Chiral photonics has emerged as a key technology for future optoelectronics, such as quantum information and encryption, by making use of photonic waves from enantiomeric structures. An inevitable challenge for realizing such chiral optoelectronics is the development of near-infrared circularly polarized (NIR CP) light-sensing photodetectors that convert optical power and circular polarization direction into distinguishable electrical signals. Herein, a simple and promising strategy for high-performance NIR CP light-sensing organic phototransistors (NIR CPL-OPTRs) applicable to highly secure optoelectronic encryption is proposed. By directly assembling a standalone cholesteric liquid-crystal network film in a thin-film NIR CPL-OPTR, remarkable responsivity and distinguishability are achieved. The synergetic effect of amplification of the photocurrent signal by the applied electric field and improved light absorption by the reduced reflection in the multilayered structure leads to high responsivity. As a proof-of-concept, the chiral phototransistor arrays are demonstrated as a physically unclonable function device and exhibit enhanced cryptographic characteristics.
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