Rapid Voltage Sensing with Single Nanorods via the Quantum Confined Stark Effect.,ACS Photonics

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Rapid Voltage Sensing with Single Nanorods via the Quantum Confined Stark Effect.
ACS Photonics ( IF 6.5 ) Pub Date : 2018-06-24 , DOI: 10.1021/acsphotonics.8b00206
Omri Bar-Elli ₁ , Dan Steinitz ₁ , Gaoling Yang ₁ , Ron Tenne ₁ , Anastasia Ludwig ₂ , Yung Kuo ₃ , Antoine Triller ₂ , Shimon Weiss _{3,

4} , Dan Oron ₁

Affiliation

Properly designed colloidal semiconductor quantum dots (QDs) have already been shown to exhibit high sensitivity to external electric fields via the quantum confined Stark effect (QCSE). Yet, detection of the characteristic spectral shifts associated with the effect of the QCSE has traditionally been painstakingly slow, dramatically limiting the sensitivity of these QD sensors to fast transients. We experimentally demonstrate a new detection scheme designed to achieve shot-noise-limited sensitivity to emission wavelength shifts in QDs, showing feasibility for their use as local electric field sensors on the millisecond time scale. This regime of operation is already potentially suitable for detection of single action potentials in neurons at a high spatial resolution.

中文翻译：

通过量子限制斯塔克效应利用单个纳米棒进行快速电压感测。

正确设计的胶体半导体量子点（QD）已经显示出通过量子限制斯塔克效应（QCSE）对外部电场具有很高的灵敏度。然而，传统上，与QCSE效应相关的特征性光谱偏移的检测一直十分缓慢，这极大地限制了这些QD传感器对快速瞬变的灵敏度。我们通过实验证明了一种新的检测方案，该方案旨在对QD中的发射波长偏移实现散粒噪声限制的灵敏度，从而证明了将其用作毫秒级的本地电场传感器的可行性。这种操作方式已经潜在地适合于以高空间分辨率检测神经元中的单个动作电位。

更新日期：2018-06-24

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