TY - JOUR
T1 - Nonlinear spectroscopy in the near-field
T2 - Time resolved spectroscopy and subwavelength resolution non-invasive imaging
AU - Namboodiri, Mahesh
AU - Khan, Tahirzeb
AU - Karki, Khadga
AU - Kazemi, Mehdi Mohammad
AU - Bom, Sidhant
AU - Flachenecker, Günter
AU - Namboodiri, Vinu
AU - Materny, Arnulf
N1 - Publisher Copyright:
© 2014 Science Wise Publishing & De Gruyter.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - The combination of near-field microscopy along with nonlinear optical spectroscopic techniques is presented here. The scanning near-field imaging technique can be integrated with nonlinear spectroscopic techniques to improve spatial and axial resolution of the images. Additionally, ultrafast dynamics can be probed down to nano-scale dimension. The review shows some examples for this combination, which resulted in an exciton map and vibrational contrast images with subwavelength resolution. Results of two-color femtosecond time-resolved pump-probe experiments using scanning near-field optical microscopy (SNOM) on thin films of the organic semiconductor 3,4,9,10 Perylenetetracarboxylic dianhydride (PTCDA) are presented. While nonlinear Raman techniques have been used to obtain highly resolved images in combination with near-field microscopy, the use of femtosecond laser pulses in electronic resonance still constitutes a big challenge. Here, we present our first results on coherent anti-Stokes Raman scattering (fs-CARS) with femtosecond laser pulses detected in the near-field using SNOM. We demonstrate that highly spatially resolved images can be obtained from poly(3-hexylthiophene) (P3HT) nano-structures where the fs-CARS process was in resonance with the P3HT absorption and with characteristic P3HT vibrational modes without destruction of the samples. Sub-diffraction limited lateral resolution is achieved. Especially the height resolution clearly surpasses that obtained with standard microCARS. These results will be the basis for future investigations of mode-selective dynamics in the near-field.
AB - The combination of near-field microscopy along with nonlinear optical spectroscopic techniques is presented here. The scanning near-field imaging technique can be integrated with nonlinear spectroscopic techniques to improve spatial and axial resolution of the images. Additionally, ultrafast dynamics can be probed down to nano-scale dimension. The review shows some examples for this combination, which resulted in an exciton map and vibrational contrast images with subwavelength resolution. Results of two-color femtosecond time-resolved pump-probe experiments using scanning near-field optical microscopy (SNOM) on thin films of the organic semiconductor 3,4,9,10 Perylenetetracarboxylic dianhydride (PTCDA) are presented. While nonlinear Raman techniques have been used to obtain highly resolved images in combination with near-field microscopy, the use of femtosecond laser pulses in electronic resonance still constitutes a big challenge. Here, we present our first results on coherent anti-Stokes Raman scattering (fs-CARS) with femtosecond laser pulses detected in the near-field using SNOM. We demonstrate that highly spatially resolved images can be obtained from poly(3-hexylthiophene) (P3HT) nano-structures where the fs-CARS process was in resonance with the P3HT absorption and with characteristic P3HT vibrational modes without destruction of the samples. Sub-diffraction limited lateral resolution is achieved. Especially the height resolution clearly surpasses that obtained with standard microCARS. These results will be the basis for future investigations of mode-selective dynamics in the near-field.
KW - Femtosecond time-resolved spectroscopy
KW - Nonlinear optical spectroscopy
KW - Organic semiconductor nanostructures
KW - Scanning near-field optical microscopy
KW - Surface enhanced coherent anti-Stokes Raman scattering
KW - Transient absorption spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84921409295&partnerID=8YFLogxK
U2 - 10.1515/nanoph-2013-0044
DO - 10.1515/nanoph-2013-0044
M3 - 文献综述
AN - SCOPUS:84921409295
SN - 2192-8606
VL - 3
SP - 61
EP - 73
JO - Nanophotonics
JF - Nanophotonics
IS - 1-2
ER -