Chiroptical signal enhancement in quasi-null-polarization-detection geometry: Intrinsic limitations

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Title
Chiroptical signal enhancement in quasi-null-polarization-detection geometry: Intrinsic limitations
Author(s)
Hanju Rhee; Intae Eom; Sung-Hyun Ahn; Ki-Hee Song; Minhaeng Cho
Publication Date
2015-05
Journal
PHYSICAL REVIEW A, v.91, no.5, pp.053839 -
Publisher
AMER PHYSICAL SOC
Abstract
Despite its unique capability of distinguishing molecular handedness, chiroptical spectroscopy suffers from the weak-signal problem, which has restricted more extensive applications. The quasi-null-polarization-detection (QNPD) method has been shown to be useful for enhancing the chiroptical signal. Here, the underlying enhancement mechanism in the QNPD method combined with a heterodyne detection scheme is elucidated. It is experimentally demonstrated that the optical rotatory dispersion signal can be amplified by a factor of ∼400, which is the maximum enhancement effect achievable with our femtosecond laser setup. The upper limit of the QNPD enhancement effect of chiroptical measurements could, in practice, be limited by imperfection of the polarizer and finite detection sensitivity. However, we show that there exists an intrinsic limit in the enhancement with the QNPD method due to the weak but finite contribution from the homodyne chiroptical signal. This is experimentally verified by measuring the optical rotation of linearly polarized light with the QNPD scheme. We further provide discussions on the connection between this intrinsic limitation in the QNPD scheme for enhanced detection of weak chiroptical signals and those in optical enantioselectivity and Raman optical activity with a structured chiral field. We anticipate that the present work could be useful in further developing time-resolved nonlinear chiroptical spectroscopy. ©2015 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/2030
ISSN
2469-9926
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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