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Abstract
A polarization-modulation-based Goos–Hanchen (GH) sensing scheme leveraging the polarization-dependence of the Bloch surface wave enhanced GH shift is proposed and experimentally demonstrated. Based on a simple setup utilizing a liquid crystal modulator to switch the polarization state of the input beam periodically, the alternating positions of the reflected beam for both polarizations are monitored by a lock-in amplifier to handily retrieve the GH shift signal. The conventional direct measurement of the beam position for the target state of polarization is vulnerable to instabilities in the optomechanical setup and alignment. Our proposed scheme provides a sensitive yet robust GH shift-sensing setup where the common mode drift and noise could be suppressed to ensure better system stability.
Highlights
For a couple of decades, surface plasmon resonance (SPR) has been extensively studied as a powerful diagnostic tool for real-time, label-free bio-related detection [1]
Results and Discussions by a polarizer to illuminate on the said Bloch surface wave (BSW) enhanced GH shift sensor chip
At the beginning of the experiment, it is important to confirm the excitation of the BSW, which measured by a position-sensitive detector (PSD, S3979, Hamamatsu, Japan) with a PSD signal could be beginning observed ofbytheangular scanning the reflected intensity
Summary
For a couple of decades, surface plasmon resonance (SPR) has been extensively studied as a powerful diagnostic tool for real-time, label-free bio-related detection [1]. In order to simplify the interferometric setups for phase detection, phase-related or phase-enhanced intensity measurement has been studied to improve the sensitivity [5] Another scheme is to directly measure the Goos–Hanchen (GH) shift which is proportional to the phase change induced by the SPR effect, where a potentially simple yet sensitive sensing system for biosensing applications has been proposed and demonstrated [6]. Can be excited at the interface of a truncated one-dimensional photonic crystal (PC) slab and shares certain similarities to the surface plasmon wave [13] As it propagates along the interface between two dielectrics, a much lower optical loss is obtained for the BSW, resulting in a longer lateral propagation distance and penetration depth compared to SPR. A sensitive yet robust GH sensing system could be realized with a simple setup
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