Sum-Frequency Generation in Dissipative Systems: Experimental Evidence for Optical Wave Patterns

2002 ◽  
Vol 88 (23) ◽  
Author(s):  
S. Residori ◽  
A. Petrossian ◽  
L. Gil
Keyword(s):  
Experimental Evidence ◽  
Sum Frequency Generation ◽  
Dissipative Systems ◽  
Optical Wave ◽  
Sum Frequency ◽  
Wave Patterns ◽  
Frequency Generation

Terahertz wave detection by plasmonic-antenna enhanced sum frequency generation

2021 ◽  
pp. 2050008
Author(s):  
Jie Sun ◽  
Fangxing Zhang ◽  
Zhihao Zhou ◽  
Dongyi Shen ◽  
Qiao Kang ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Detection System ◽  
Field Enhancement ◽  
Sum Frequency Generation ◽  
Indirect Detection ◽  
Generation Process ◽  
Optical Wave ◽  
Sum Frequency ◽  
Thz Wave ◽  
Frequency Generation

We propose a scheme of terahertz (THz) indirect detection via plasmonic-antenna enhanced sum frequency generation process, where the THz wave is converted to optical wave that is detected by photodetector. The gold antenna built in the structure can improve the conversion efficiency by enhancing both the optical wave and THz wave. The numerical simulations show that the field enhancement is influenced by the geometry of the antenna, so the conversion efficiency can be improved highly by optimizing the antenna. Compared with commercial detectors, our detection system has a much lower noise equivalent power (NEP) of 15.4[Formula: see text]pW/[Formula: see text] at 5[Formula: see text]THz.

Suppressing interfacial water signals to assist the peak assignment of the N+–H stretching mode in sum frequency generation vibrational spectroscopy

2015 ◽  
Vol 17 (43) ◽  
pp. 28534-28538 ◽  
Author(s):  
Khoi Tan Nguyen ◽  
Anh V. Nguyen
Keyword(s):  
Experimental Evidence ◽  
Vibrational Spectroscopy ◽  
Sum Frequency Generation ◽  
Interfacial Water ◽  
Vibrational Modes ◽  
Sum Frequency ◽  
Backbone Amide ◽  
Peak Assignment ◽  
Frequency Generation

This study provides experimental evidence that the 3080 cm−1 peak is from the N+–H vibrations, while the 3330 cm−1 peak is not due to ammonium species but rather originates from the interfacial water vibrational modes or the backbone amide modes.

Temperature Dependence of the Air/Water Interface Revealed by Polarization Sensitive Sum-Frequency Generation Spectroscopy

2018 ◽  
Author(s):  
Daniel R. Moberg ◽  
Shelby C. Straight ◽  
Francesco Paesani
Keyword(s):  
Temperature Dependence ◽  
Low Frequency ◽  
Potential Energy Function ◽  
Md Simulations ◽  
Sum Frequency Generation ◽  
Water Molecules ◽  
Water Interface ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

<div> <div> <div> <p>The temperature dependence of the vibrational sum-frequency generation (vSFG) spectra of the the air/water interface is investigated using many-body molecular dynamics (MB-MD) simulations performed with the MB-pol potential energy function. The total vSFG spectra calculated for different polarization combinations are then analyzed in terms of molecular auto-correlation and cross-correlation contributions. To provide molecular-level insights into interfacial hydrogen-bonding topologies, which give rise to specific spectroscopic features, the vSFG spectra are further investigated by separating contributions associated with water molecules donating 0, 1, or 2 hydrogen bonds to neighboring water molecules. This analysis suggests that the low frequency shoulder of the free OH peak which appears at ∼3600 cm−1 is primarily due to intermolecular couplings between both singly and doubly hydrogen-bonded molecules. </p> </div> </div> </div>

Bulk Contributions Modulate the Sum-Frequency Generation Spectra of Interfacial Water on Model Sea-Spray Aerosols

2018 ◽  
Author(s):  
Sandeep K. Reddy ◽  
Raphael Thiraux ◽  
Bethany A. Wellen Rudd ◽  
Lu Lin ◽  
Tehseen Adel ◽  
...  
Keyword(s):  
Single Layer ◽  
Sum Frequency Generation ◽  
Second Order ◽  
Interfacial Structure ◽  
Sea Spray ◽  
Third Order ◽  
Systematic Analysis ◽  
Sum Frequency ◽  
Structure Of Water ◽  
Frequency Generation

Vibrational sum-frequency generation (vSFG) spectroscopy is used to determine the molecular structure of water at the interface of palmitic acid monolayers. Both measured and calculated spectra display speci c features due to third-order contributions to the vSFG response which are associated with nite interfacial electric potentials. We demonstrate that theoretical modeling enables to separate the third-order contributions, thus allowing for a systematic analysis of the strictly surface-sensitive, second-order component of the vSFG response. This study provides fundamental, molecular-level insights into the interfacial structure of water in a neutral surfactant system with relevance to single layer bio-membranes and environmentally relevant sea-spray aerosols. These results emphasize the key role that computer simulations can play in interpreting vSFG spectra and revealing microscopic details of water at complex interfaces, which can be difficult to extract from experiments due to the mixing of second-order, surface-sensitive and third-order, bulk-dependent contributions to the vSFG response.

Sum Frequency Generation Vibrational Spectroscopy of 1,3-Butadiene Hydrogenation on 4 nm Pt@SiO2, Pd@SiO2, and Rh@SiO2 Core–Shell Catalysts

Nano Letters ◽  
2014 ◽  
Vol 15 (1) ◽  
pp. 39-44 ◽  
Author(s):  
James M. Krier ◽  
William D. Michalak ◽  
Xiaojun Cai ◽  
Lindsay Carl ◽  
Kyriakos Komvopoulos ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Sum Frequency Generation ◽  
Core Shell ◽  
Sum Frequency ◽  
Frequency Generation ◽  
Butadiene Hydrogenation
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