Photothermally Probing Vibrational Excited-State Absorption with Nanoscale Spatial Resolution through Frequency-Domain Pump–Probe Peak Force Infrared Microscopy

2021 ◽  
Author(s):  
Haomin Wang ◽  
Qing Xie ◽  
Yu Zhang ◽  
Xiaoji G. Xu
Keyword(s):  
Excited State ◽  
Frequency Domain ◽  
Spatial Resolution ◽  
Excited State Absorption ◽  
Peak Force ◽  
Infrared Microscopy ◽  
Pump Probe

Liquid-Phase Peak Force Infrared Microscopy

2020 ◽  
Author(s):  
Haomin Wang ◽  
Joseph M. González-Fialkowski ◽  
Wenqian Li ◽  
Yan Yu ◽  
Xiaoji Xu
Keyword(s):  
Liquid Phase ◽  
Spatial Resolution ◽  
Shear Force ◽  
Polymer Surface ◽  
Surface Damage ◽  
Peak Force ◽  
Infrared Microscopy ◽  
Contact Mode ◽  
Force Microscopy ◽  
Hydrogen Deuterium

Atomic force microscopy-infrared microscopy (AFM-IR) provides a route to bypass Abbe’s diffraction limit through photothermal detections of infrared absorption. With the combination of total internal reflection, AFM-IR can operate in the aqueous phase. However, AFM-IR in contact mode suffers from surface damage from the lateral shear force between the tip and sample, and can only achieve 20~25-nm spatial resolution. Here, we develop the liquid-phase peak force infrared (LiPFIR) microscopy that avoids the detrimental shear force and delivers an 8-nm spatial resolution. The non-destructiveness of the LiPFIR microscopy enables <i>in situ</i> chemical measurement of heterogeneous materials and investigations on a range of chemical and physical transformations, including polymer surface reorganization, hydrogen-deuterium isotope exchange, and ethanol-induced denaturation of proteins. We also perform LiPFIR imaging of the budding site of yeast cell wall in the fluid as a demonstration of biological applications. LiPFIR unleashes the potential of in liquid AFM-IR for chemical nanoscopy.

Investigation of Local Dynamics on the Sub-micron Scale in Organic Blends Using an Ultrafast Confocal Microscope

2010 ◽  
Vol 1270 ◽  
Author(s):  
Giulia Grancini ◽  
Dario Polli ◽  
Jenny Clark ◽  
Tersilla Virgili ◽  
Giulio Cerullo ◽  
...  
Keyword(s):  
Excited State ◽  
Confocal Microscopy ◽  
Polymer Blends ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
Electronic States ◽  
Pump Probe ◽  
Peculiar Behaviour ◽  
Spatio Temporal ◽  
Probe Spectroscopy

AbstractWe introduce a novel instrument combining femtosecond pump-probe spectroscopy and confocal microscopy for spatio-temporal imaging of excited-state dynamics of phase-separated polymer blends. Phenomena occurring at interfaces between different materials are crucial for optimizing the device performances, but are poorly understood due to the variety of possible electronic states and processes involved and to their complicated dynamics. Our instrument (with 200-fs temporal resolution and 300-nm spatial resolution) provides new insights into the properties of polymer blends, revealing spatially variable photo-relaxation paths and dynamics and highlighting a peculiar behaviour at the interface between the phase-separated domains.

Excited State Absorption in Pr3+ Doped Fluorozirconate Glass

1991 ◽  
Vol 244 ◽  
Author(s):  
R. S. Quimby ◽  
B. Zheng
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Fiber Amplifier ◽  
Pump Probe ◽  
Probe Technique ◽  
Zblan Glass ◽  
Fluorozirconate Glass ◽  
A New Technique ◽  
Doped Glass ◽  
Good Agreement

ABSTRACTThe excited state absorption (ESA) spectrum for Pr3+ doped ZBLAN glass is determined using a new technique based on the McCumber theory [D.E. McCumber, Phys. Rev. 136, A954 (1964)]. ESA peaks at 1380 and 840 nm are found, corresponding to transitions from the 1G4 to the 1D2 and 1I6 levels, respectively. ESA at the fiber amplifier pump wavelength 1.017 μm is found to be very small. The new method is also applied to Er+ doped glass, and good agreement is obtained between the resulting ESA spectrum and previous measurements using a traditional pump-probe technique.

Measurement of the Excited-State Molecular Polarizability of C60

1994 ◽  
Vol 359 ◽  
Author(s):  
N. Tang ◽  
R. W. Hellwarth ◽  
J. P. Partanen
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Benzene Solution ◽  
Excited State Absorption ◽  
Molecular Polarizability ◽  
Wave Mixing ◽  
Pump Probe ◽  
Probe Experiment ◽  
Pump Probe Experiment ◽  
532 Nm

ABSTRACTWe use ∼30 ps pulses at 532 nm to measure the complex excited-state molecular polarizability αe in a C60/benzene solution. We determine the imaginary part of αe by measuring the excited-state absorption cross-section in a pump-probe experiment. In a degenerate-four-wave-mixing (DFWM) experiment, we find that in delayed probing of the complex index gratings formed by ∼30 ps pulses, the thermal and the excited-state polarizability changes both contribute to these transient gratings.

scholarly journals Liquid-Phase Peak Force Infrared Microscopy

2020 ◽  
Author(s):  
Haomin Wang ◽  
Joseph M. González-Fialkowski ◽  
Wenqian Li ◽  
Qing Xie ◽  
Yan Yu ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Spatial Resolution ◽  
Shear Force ◽  
Polymer Surface ◽  
Surface Damage ◽  
Peak Force ◽  
Infrared Microscopy ◽  
Contact Mode ◽  
Force Microscopy ◽  
Hydrogen Deuterium

Atomic force microscopy-infrared microscopy (AFM-IR) provides a route to bypass Abbe’s diffraction limit through photothermal detections of infrared absorption. With the combination of total internal reflection, AFM-IR can operate in the aqueous phase. However, AFM-IR in contact mode suffers from surface damage from the lateral shear force between the tip and sample, and can only achieve 20~25-nm spatial resolution. Here, we develop the liquid-phase peak force infrared (LiPFIR) microscopy that avoids the detrimental shear force and delivers an 8-nm spatial resolution. The non-destructiveness of the LiPFIR microscopy enables <i>in situ</i> chemical measurement of heterogeneous materials and investigations on a range of chemical and physical transformations, including polymer surface reorganization, hydrogen-deuterium isotope exchange, and ethanol-induced denaturation of proteins. We also perform LiPFIR imaging of the budding site of yeast cell wall in the fluid as a demonstration of biological applications. LiPFIR unleashes the potential of in liquid AFM-IR for chemical nanoscopy.

Nanoscale spectroscopic and mechanical characterization of individual aerosol particles using peak force infrared microscopy

2017 ◽  
Vol 53 (53) ◽  
pp. 7397-7400 ◽  
Author(s):  
Le Wang ◽  
Dandan Huang ◽  
Chak K. Chan ◽  
Yong Jie Li ◽  
Xiaoji G. Xu
Keyword(s):  
Particulate Matter ◽  
Spatial Resolution ◽  
Infrared Imaging ◽  
Mechanical Characterization ◽  
Aerosol Particles ◽  
Fine Particulate Matter ◽  
Peak Force ◽  
Infrared Microscopy ◽  
Fine Particulate

Individual fine particulate matter (PM2.5) particles are revealed with mechanical mapping and infrared imaging at 10 nm spatial resolution.

PICOSECOND-INDUCED NONLINEAR ABSORPTION IN LIQUID CRYSTAL MEDIA

1995 ◽  
Vol 04 (01) ◽  
pp. 245-260 ◽  
Author(s):  
K. J. McEWAN ◽  
R. C. HOLLINS
Keyword(s):  
Experimental Data ◽  
Liquid Crystal ◽  
Excited State ◽  
Nonlinear Absorption ◽  
Excited State Absorption ◽  
Photon Absorption ◽  
Isotropic Phase ◽  
Pump Probe ◽  
Two Photon Absorption ◽  
Two Photon

The contributions to the nonlinear absorption of liquid crystal media in their isotropic phase are measured using a picosecond pump/probe technique at 587 nm. Good agreement between the experimental data and theory is obtained by assuming that two-photon absorption and excited state absorption dominate the nonlinear optical response. The important parameters are extracted from the experimental data and it is shown that the nonlinear absorption depends strongly on the molecular structure. The lifetime of the excited state is measured and found to compare well with the fluorescence lifetime.

Study of excitedstate absorption of C70/toluene solution using timeresolved nondegenerate pumpprobe system

2013 ◽  
Vol 25 (2) ◽  
pp. 495-499
Author(s):  
张磊 Zhang Lei ◽  
李中国 Li Zhongguo ◽  
聂仲泉 Nie Zhongquan ◽  
杨俊义 Yang Junyi ◽  
宋瑛林 Song Yinglin
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Toluene Solution ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe System
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