Tip-enhanced Raman spectroscopy mapping with strong longitudinal field excitation

Zhang, M.; Wang, J.; Tian, Qi

doi:10.1016/j.optcom.2013.10.069

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Thus, it is an effective way to obtain strong TER signals by illuminating the tip apex using a light beam with strong longitudinal field component under tight focusing. In the previous works, it was demonstrated that the metallic tip was axially excited via the focused radial vector beam (RVB) can obtain a higher TER signal than that of the linear polarized beam (LPB) excitation [18][19][20] because RVB has stronger longitudinal electric field component than that of LPB in case of tight focusing [19].…”

Section: Introductionmentioning

confidence: 99%

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Zhang

et al. 2019

Nanophotonics

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Tip-enhanced Raman spectroscopy (TERS) is a very useful method to achieve label-free and super-resolution imaging, and the plasmonic tip nanofocusing plays a decisive role for TERS performance. Here, we present a method to enhance the nanofocusing characteristic of a plasmonic tip integrated in a grating near the tip apex. Simulation results show that the grating near the tip apex can significantly improve the electric field intensity of the nanofocusing field compared with a conventional bare tip, under axial excitation of a tightly focused radial vector beam. The electric field enhancement characteristic is quantified in relation with the groove number of grating, excitation wavelength, period of grating, and numerical aperture of the micro-objective (MO). These simulation results could be a good reference to fabricate a plasmonic tip for TERS applications, which is an effective way to promote the development of tip-enhanced near-field optical microscopy.

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Section: Introductionmentioning

confidence: 99%

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Zhang

et al. 2019

Nanophotonics

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“…In recent years, the free space-based cylindrical vector beams (CVBs), as an important part of the light field regulation, have attracted extensive attention. Due to possessing polarization singularity distribution characteristic under condition of tight focusing, the CVBs have been extensively explored in many fields of the nonlinear effect enhancement [1], tip-enhanced Raman spectroscopy (TERS) [2][3][4], molecular orientation detection [5], dark-state excitation [6], micro/nano fabrication [7], optical tweezers [8], etc. In addition, it is noteworthy that the optical fiber-based CVBs would also open up various applications, such as optical fiber CVBs-based communication [9], fiber CVBs-based sensing [10], backgroundless plasmonic tip nanofocusing [11], quantum entanglement [12], stimulated emission depletion (STED) microscopy [13], surface enhanced Raman spectroscopy (SERS) [14], etc.…”

Section: Introductionmentioning

confidence: 99%

Generation and Nonlinear Frequency Conversion of Nanosecond Cylindrical Vector Beams in Two-Mode Fiber

Zhang¹,

Zhang²,

Li³

et al. 2019

Preprint

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We present the generation and nonlinear frequency conversion of nanosecond cylindrical vector beams (CVBs) in two-mode fiber (TMF). Based on the polarized dependence vector mode coupling characteristic and the precise wavelength tunability of an acoustically-induced fiber grating (AIFG), the nanosecond cylindrical vector beams (CVBs, 1064 nm, 10 ns) is directly generated in a TMF with convenient switching characteristics between the radial and azimuthal vector beams. Furthermore, the stimulated Raman scattering (SRS) is produced based on the transmission of the nanosecond CVBs in the 100-meters long TMF, and the spatial intensity and polarization distributions characteristics the 1st-order Stokes shifted component is consistent with the nanosecond CVBs pump pulse. This work provides a method for achieving wavelength conversion of the CVBs in optical fiber.

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“…In 2004, Kawata et al [ 28 ] introduced a quasi-radially polarized beam generated by a four-section polarizer to an inverted-illumination TERS configuration and then obtained a stronger TERS signal compared with linearly polarized light excitation, because the quasi-radially polarized beam had a stronger longitudinal component than linearly polarized light [ 29 , 30 , 31 , 32 ]. In 2014, Zhang et al [ 33 ] experimentally verified the longitudinal field excited TERS enhancement using transmission-mode TERS setup, which is six times higher than that with focused linearly polarized light excitation. To date, most of these studies have focused on application of radial polarized vector beams, which are generated in free space by using the waveplates or spatial light modulators on TERS systems.…”

Section: Introductionmentioning

confidence: 99%

Tip-Enhanced Raman Spectroscopy with High-Order Fiber Vector Beam Excitation

Huang

Han

et al. 2018

Sensors

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We investigated tip-enhanced Raman spectra excited by high-order fiber vector beams. Theoretical analysis shows that the high-order fiber vector beams have stronger longitudinal electric field components than linearly polarized light under tight focusing conditions. By introducing the high-order fiber vector beams and the linearly polarized beam from a fiber vector beam generator based on an electrically-controlled acoustically-induced fiber grating into a top-illumination tip-enhanced Raman spectroscopy (TERS) setup, the tip-enhanced Raman signal produced by the high-order fiber vector beams was 1.6 times as strong as that produced by the linearly polarized light. This result suggests a new type of efficient excitation light beams for TERS.

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Tip-enhanced Raman spectroscopy mapping with strong longitudinal field excitation

Cited by 8 publications

References 11 publications

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Grating-assisted coupling enhancing plasmonic tip nanofocusing illuminated via radial vector beam

Generation and Nonlinear Frequency Conversion of Nanosecond Cylindrical Vector Beams in Two-Mode Fiber

Tip-Enhanced Raman Spectroscopy with High-Order Fiber Vector Beam Excitation

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