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sensitive gap-enhanced raman spectroscopy with a perfect radially polarized beam
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نویسنده
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yang aiping ,du luping ,dou xiujie ,meng fanfei ,zhang chonglei ,min changjun ,lin jiao ,yuan xiaocong
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منبع
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plasmonics - 2018 - دوره : 13 - شماره : 3 - صفحه:991 -996
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چکیده
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Gap mode surface-enhanced raman spectroscopy (sers) enables high enhancement of raman signal. however, the polarization of excitation light shows great influence on the excitation of gap mode and hence on the raman enhancement. here, we propose a nanoparticle-on-film gap mode sers accompanying with a new type of excitation source called as perfect radially polarized (prp) beam. the prp beam possesses a ring-shaped beam pattern that can be tuned to match the surface plasmon resonance angle under a tight focusing condition, hence improving greatly the excitation efficiency of surface plasmon polaritons, and eventually the sensitivity of gap mode sers. such kind of enhanced-raman system with a prp beam has a great potential on the applications such as single molecule raman detection.
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کلیدواژه
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surface plasmon ,gap mode ,sers ,vector beam
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آدرس
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shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china, shenzhen university, nanophotonics research centre, china
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Authors
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