Highly photoresponsive and wavelength-selective circularly-polarized-light detector based on metal-oxides hetero-chiral thin film

Scientific Reports
Seung Hee LeeJong Kyu Kim

Abstract

A highly efficient circularly-polarized-light detector with excellent wavelength selectivity is demonstrated with an elegant and simple microelectronics-compatible way. The circularly-polarized-light detector based on a proper combination of the geometry-controlled TiO2-SnO2 hetero-chiral thin film as an effective chiroptical filter and the Si active layer shows excellent chiroptical response with external quantum efficiency as high as 30% and high helicity selectivity of ~15.8% in an intended wavelength range. Furthermore, we demonstrated the ability of manipulating both bandwidth and responsivity of the detector simultaneously in whole visible wavelength range by a precise control over the geometry and materials constituting hetero-chiral thin film. The high efficiency, wavelength selectivity and compatibility with conventional microelectronics processes enabled by the proposed device can result in remarkable developments in highly integrated photonic platforms utilizing chiroptical responses.

References

May 18, 1987·Physical Review Letters·E Yablonovitch
Mar 16, 2004·Applied Optics·Kate Kaminska, Kevin Robbie
Jun 29, 2004·Applied Optics·Andy C van PoptaMichael J Brett
Oct 7, 2006·Nature·Jacob F ShersonEugene S Polzik
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Jun 25, 2009·Optics Express·Yong Jun ParkChang Kwon Hwangbo

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Citations

Oct 7, 2016·Chemical Communications : Chem Comm·Hyeon-Ho JeongPeer Fischer
Jul 14, 2016·Nanoscale·Francisco Hidalgo, Cecilia Noguez

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Methods Mentioned

BETA
X-ray
chip
scanning electron microscopy

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