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.

Double-Resonant Sum-Frequency Generation of Blue Light with Near-Unity Quantum Conversion Efficiency

2020 ◽  
Author(s):  
Hugo Kerdoncuff ◽  
Jesper B. Christensen ◽  
Tulio B. Brasil ◽  
Valeriy A. Novikov ◽  
Eugene Polzik ◽  
...  
Keyword(s):  
Blue Light ◽  
Conversion Efficiency ◽  
Sum Frequency Generation ◽  
Sum Frequency ◽  
Frequency Generation

scholarly journals Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency

2020 ◽  
Vol 28 (3) ◽  
pp. 3975 ◽  
Author(s):  
Hugo Kerdoncuff ◽  
Jesper B. Christensen ◽  
Túlio B. Brasil ◽  
Valeriy A. Novikov ◽  
Eugene S. Polzik ◽  
...  
Keyword(s):  
Blue Light ◽  
Conversion Efficiency ◽  
Sum Frequency Generation ◽  
Sum Frequency ◽  
Frequency Generation

scholarly journals Direct visualization of phase-matched efficient second harmonic and broadband sum frequency generation in hybrid plasmonic nanostructures

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhe Li ◽  
Brian Corbett ◽  
Agnieszka Gocalinska ◽  
Emanuele Pelucchi ◽  
Wen Chen ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Second Harmonic ◽  
Effective Means ◽  
Sum Frequency Generation ◽  
Mode Analysis ◽  
Plasmonic Nanostructures ◽  
Integrated Photonics ◽  
Direct Visualization ◽  
Sum Frequency ◽  
Frequency Generation

Abstract Second harmonic generation and sum frequency generation (SHG and SFG) provide effective means to realize coherent light at desired frequencies when lasing is not easily achievable. They have found applications from sensing to quantum optics and are of particular interest for integrated photonics at communication wavelengths. Decreasing the footprints of nonlinear components while maintaining their high up-conversion efficiency remains a challenge in the miniaturization of integrated photonics. Here we explore lithographically defined AlGaInP nano(micro)structures/Al2O3/Ag as a versatile platform to achieve efficient SHG/SFG in both waveguide and resonant cavity configurations in both narrow- and broadband infrared (IR) wavelength regimes (1300–1600 nm). The effective excitation of highly confined hybrid plasmonic modes at fundamental wavelengths allows efficient SHG/SFG to be achieved in a waveguide of a cross-section of 113 nm × 250 nm, with a mode area on the deep subwavelength scale (λ2/135) at fundamental wavelengths. Remarkably, we demonstrate direct visualization of SHG/SFG phase-matching evolution in the waveguides. This together with mode analysis highlights the origin of the improved SHG/SFG efficiency. We also demonstrate strongly enhanced SFG with a broadband IR source by exploiting multiple coherent SFG processes on 1 µm diameter AlGaInP disks/Al2O3/Ag with a conversion efficiency of 14.8% MW−1 which is five times the SHG value using the narrowband IR source. In both configurations, the hybrid plasmonic structures exhibit >1000 enhancement in the nonlinear conversion efficiency compared to their photonic counterparts. Our results manifest the potential of developing such nanoscale hybrid plasmonic devices for state-of-the-art on-chip nonlinear optics applications.

Sum frequency generation process for a new astronomical instrument

2014 ◽  
Author(s):  
R. Baudoin ◽  
J. T. Gomes ◽  
L. Delage ◽  
L. Grossard ◽  
T. A. Ten Brummelar ◽  
...  
Keyword(s):  
Sum Frequency Generation ◽  
Generation Process ◽  
Sum Frequency ◽  
Frequency Generation ◽  
Astronomical Instrument

Probing Water and Biomolecules at the Air—Water Interface with a Broad Bandwidth Vibrational Sum Frequency Generation Spectrometer from 3800 to 900 cm−1

2009 ◽  
Vol 63 (5) ◽  
pp. 528-537 ◽  
Author(s):  
Gang Ma ◽  
Jian Liu ◽  
Li Fu ◽  
Elsa C. Y. Yan
Keyword(s):  
Detection System ◽  
Sum Frequency Generation ◽  
Water Dynamics ◽  
Lipid Monolayer ◽  
Water Interface ◽  
Regenerative Amplifier ◽  
Broad Bandwidth ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

We have built a broad bandwidth vibrational sum frequency generation (VSFG) spectrometer that can provide high-quality spectra over the range of 3800 to 900 cm−1. The spectrometer contains a commercial Ti:sapphire based 6 W regenerative amplifier as the master light source, a home-built pulse shaper to produce a narrow bandwidth 800 nm beam, a commercial optical parametric amplifier to generate a broad bandwidth femtosecond infrared (IR) pulse, and a detection system with a monochromator and a charge-coupled device (CCD). We applied this spectrometer to obtain VSFG spectra of a lipid monolayer at the air–water interface in the O–H stretching region (3800–3000 cm−1), the C–H stretching region (3100–2700 cm−1), the C–D stretching region (2300–2000 cm−1), the C=O stretching region (1800–1700 cm−1), and the PO2− symmetric stretching region (1200–1000 cm−1). We also obtained the VSFG spectrum of neat water in the O–H stretching region (3800–3000 cm−1) and the VSFG spectrum of a protein, α-synuclein, in the amide I region (1700–1600 cm−1) at the air–water interface. The spectrometer can provide a VSFG spectrum in the O–H stretching region (3800–3000 cm−1) without scanning the IR frequency. This feature will be useful in probing water dynamics at interfaces because the free OH and H-bonded OH can be investigated simultaneously. We have also provided instrumental details and discussed further improvements that should be beneficial to other researchers interested in setting up VSFG instrumentation.

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>

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