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Selective Coherent Anti-Stokes Raman Scattering Microscopy Employing Dual-Wavelength Nanofocused Ultrafast Plasmon Pulses
Nano Letters ( IF 9.6 ) Pub Date : 2018-01-31 00:00:00 , DOI: 10.1021/acs.nanolett.7b05078 Keita Tomita 1 , Yasuhiro Kojima 1 , Fumihiko Kannari 1
Nano Letters ( IF 9.6 ) Pub Date : 2018-01-31 00:00:00 , DOI: 10.1021/acs.nanolett.7b05078 Keita Tomita 1 , Yasuhiro Kojima 1 , Fumihiko Kannari 1
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Ultrafast surface plasmon polariton (SPP) nanofocusing on a plasmonic metal tapered tip with femtosecond laser pulses enables background-free localized excitation beyond the diffraction limit. We demonstrate simultaneous nanofocusing of ultrafast SPP pulses at 440 and 800 nm, which were coupled with a common diffraction grating structure fabricated on an aluminum (Al) tapered tip, to the tip apex with a radius of ∼35 nm. We achieved selective coherent anti-Stokes Raman scattering (CARS) microscopy that combined an 800 nm (ω) SPP pump pulse, which achieves selective vibrational excitation by spectral focusing, and a 440 nm (2ω) SPP probe pulse. Raman intensity of this novel 2ω-CARS increased by a factor of 3.96 at the G-band and 4.00 at the 2D-band compared with that with ω-CARS for the monolayer graphene. The 2ω-CARS imaging method was applied for imaging a multiwalled carbon nanotube at the D-, G-, and 2D-bands. This dual-wavelength nanofocusing will open up new nanoscale microspectroscopy and optical excitation at the tip apex, such as sum frequency mixing, two-photon excitation.
中文翻译：
使用双波长纳米聚焦超快等离子脉冲的选择性相干抗斯托克斯拉曼散射显微镜
超快表面等离振子极化（SPP）纳米聚焦在具有飞秒激光脉冲的等离激元金属锥形尖端上，可实现超出衍射极限的无背景局部激发。我们展示了在440和800 nm处同时对超快SPP脉冲进行纳米聚焦，它们与在铝（Al）锥形尖端上制造的普通衍射光栅结构耦合到半径约为35 nm的尖端顶点。我们实现了选择性相干抗斯托克斯拉曼散射（CARS）显微镜，该显微镜结合了800 nm（ω）SPP泵浦脉冲和440 nm（2ω）SPP探测脉冲，可通过光谱聚焦实现选择性振动激发。与单层石墨烯的ω-CARS相比，该新型2ω-CARS的拉曼强度在G波段增加了3.96倍，在2D波段增加了4.00倍。2ω-CARS成像方法被用于在D波段，G波段和2D波段对多壁碳纳米管成像。这种双波长纳米聚焦将开辟新的纳米级光谱学和尖端顶点的光激发，例如和频混合，双光子激发。
更新日期：2018-01-31
中文翻译：
使用双波长纳米聚焦超快等离子脉冲的选择性相干抗斯托克斯拉曼散射显微镜
超快表面等离振子极化（SPP）纳米聚焦在具有飞秒激光脉冲的等离激元金属锥形尖端上，可实现超出衍射极限的无背景局部激发。我们展示了在440和800 nm处同时对超快SPP脉冲进行纳米聚焦，它们与在铝（Al）锥形尖端上制造的普通衍射光栅结构耦合到半径约为35 nm的尖端顶点。我们实现了选择性相干抗斯托克斯拉曼散射（CARS）显微镜，该显微镜结合了800 nm（ω）SPP泵浦脉冲和440 nm（2ω）SPP探测脉冲，可通过光谱聚焦实现选择性振动激发。与单层石墨烯的ω-CARS相比，该新型2ω-CARS的拉曼强度在G波段增加了3.96倍，在2D波段增加了4.00倍。2ω-CARS成像方法被用于在D波段，G波段和2D波段对多壁碳纳米管成像。这种双波长纳米聚焦将开辟新的纳米级光谱学和尖端顶点的光激发，例如和频混合，双光子激发。
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