Sensitive Gap-Enhanced Raman Spectroscopy with a Perfect Radially Polarized Beam

Yang, Aiping; Du, Luping; Dou, Xiujie; Meng, Fanfei; Zhang, Chonglei; Min, Changjun; Lin, Jiao; Yuan, Xiaocong

doi:10.1007/s11468-017-0597-y

Cited by 14 publications

(6 citation statements)

References 35 publications

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“…In addition to the morphology, shaping the incident beam in a tight focusing condition could also bring significant outcomes on the scattering of the light with NPs. Collimated and tightly focused beams interacting with spherical NPs are of great interests in various applications, such as SERS, optical tweezers, etc [24][25][26][27][28]. Various methods have been developed for the vectorial description of a tightly focused incident beam and their interaction with spherical NPs [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Tightly focused linearly and radially polarized beam effect on the LSPR peak with varying particle size

Sarita,

Jha,

Singh

2023

Phys. Scr.

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Interactions of gold and silver spherical nanoparticles (NPs) of a wide range of radius size with tightly focused beams are investigated for a wide range of wavelengths. The scattering of tightly focused beams with a single NP of varying size is examined using a generalized Mie theory and average intensity enhancement in the near-field due to localized surface plasmons is examined for different tightly focused beams. A multipole expansion approach is used to observe the contribution of modes in shaping the scattered light intensity. Influence of particle size and tightly focused beam on intensity enhancement factor is investigated and a shift in localized surface plasmon resonance (LSPR) peak towards higher wavelength is observed with increasing particle size. Maximum intensity enhancement factor due to scattering of different incident beams by a metallic NP is theoretically examined and reported. Gold and silver NP having radius size of ranging from 30-60nm and 1-15nm respectively showed a maximum intensity enhancement factor in different media. A significant enhancement for the tightly focused radially polarized beam is observed for gold and silver NPs of radius size between 50nm and 100nm. Variation towards higher wavelength in LSPR peak due to involvement of higher order of multipoles, and the surrounding medium are also examined in detail.

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Section: Introductionmentioning

confidence: 99%

Tightly focused linearly and radially polarized beam effect on the LSPR peak with varying particle size

Sarita,

Jha,

Singh

2023

Phys. Scr.

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“…Since Ashkin first proposed optical tweezers (OTs) in 1986 [1] , this device has been widely used in many fields, including biological particle trapping [2][3][4][5] , molecular manipulation [6,7] , Raman spectroscopy [8][9][10] , and so on [11][12][13][14][15][16] . Compared to other conventional mechanical tweezers, OTs can capture and manipulate the entire particle in a non-direct contact and damage-free manner, which is suitable for trapping vulnerable particles, especially in biological experiments [17,18] .…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle trapping by counter-surface plasmon polariton lens

et al. 2022

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A counter-surface plasmon polariton lens (CSPPL) is proposed to perform stable nanoparticle trapping by providing up to 120k b T optical potential depth. The optical potential depth is related to the incident angle and phase difference of the light incident on two gratings of CSPPL. The depth of optical potential can be manipulated with negligible displacement by the incident angle less than 20°. Both the depth and the center position of the optical potential well can be manipulated by the incident phase difference. The study of stable and manipulatable optical potential on the CSPPL promotes the integration of optical tweezers.

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“…The z -electric field intensity at the focal point is only half that of the radially polarized light, reducing the enhancement effect and sensitivity in TERS [ 19 ]. To further improve the Raman intensity, a perfect radially polarized beam is used [ 20 , 21 ]. However, a complex optical system is required, irrespective of the type of light used.…”

Section: Introductionmentioning

confidence: 99%

Tip-Enhanced Raman Spectroscopy Based on Spiral Plasmonic Lens Excitation

Sun

Zhang

2022

Sensors

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In this study, we proposed the idea of replacing the traditional objective lens in bottom-illumination mode with a plasmonic lens (PL) to achieve tip-enhanced Raman spectroscopy (TERS). The electric field energy of surface plasmon polaritons (SPPs) of the spiral PL was found to be more concentrated at the focal point without any sidelobe using the finite-difference time domain (FDTD) method compared with that of a symmetry-breaking PL. This property reduces far-field background noise and increases the excitation efficiency of the near-field Raman signal. The disadvantage of only the near-field Raman scattering of samples at the center of the structure being detected when using an ordinary PL in TERS is overcome by using our proposed method of changing only the polarization of the incident light.

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Sensitive Gap-Enhanced Raman Spectroscopy with a Perfect Radially Polarized Beam

Cited by 14 publications

References 35 publications

Tightly focused linearly and radially polarized beam effect on the LSPR peak with varying particle size

Tightly focused linearly and radially polarized beam effect on the LSPR peak with varying particle size

Nanoparticle trapping by counter-surface plasmon polariton lens

Tip-Enhanced Raman Spectroscopy Based on Spiral Plasmonic Lens Excitation

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