scholarly journals Attenuated Total Reflection for Terahertz Modulation, Sensing, Spectroscopy and Imaging Applications: A Review

2020 ◽  
Vol 10 (14) ◽  
pp. 4688 ◽  
Author(s):  
Yuxin Huang ◽  
Ranjan Singh ◽  
Lijuan Xie ◽  
Yibin Ying
Keyword(s):  
Surface Plasmon ◽  
Analytical Methods ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Thz Spectroscopy ◽  
Wave Modulation ◽  
Thz Wave ◽  
Recent Advances ◽  
Atr Spectroscopy

Terahertz (THz) technique has become one of the most promising analytical methods and has been applied in many fields. Attenuated total reflection (ATR) technique applied in THz spectroscopy and imaging has been proven to be superior in functionalities such as modulation, sensing, analyzing, and imaging. Here, we first provide a concise introduction to the principle of ATR, discuss the factors that impact the ATR system, and demonstrate recent advances on THz wave modulation and THz surface plasmon sensing based on the THz-ATR system. Then, applications on THz-ATR spectroscopy and imaging are reviewed. Towards the later part, the advantages and limitations of THz-ATR are summarized, and prospects of modulation, surface plasmon sensing, spectroscopy and imaging are discussed.

Innovative Substrate-Integrated Hollow Waveguide Coupled Attenuated Total Reflection Sensors for Quantum Cascade Laser Based Infrared Spectroscopy in Harsh Environments

2021 ◽  
pp. 000370282110643
Author(s):  
Andrea Teuber ◽  
Robert Stach ◽  
Julian Haas ◽  
Boris Mizaikoff
Keyword(s):  
Quantum Cascade Lasers ◽  
Evanescent Field ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Ir Radiation ◽  
Metal Structures ◽  
Quantum Cascade ◽  
Hollow Waveguides ◽  
Optical Alignment ◽  
Atr Spectroscopy

An innovative mid-infrared spectroscopic sensor system based on quantum cascade lasers has been developed. The system combines the versatility of substrate-integrated hollow waveguides (IHWGs) with the robustness of attenuated total reflection (ATR) crystals employed as internal reflection waveguides for evanescent field sensing. IHWGs are highly reflective metal structures that propagate infrared (IR) radiation and were used as light pipes for coupling radiation into the ATR waveguide. The combined IHWG-ATR device has been designed such that the utmost stability and robustness of the optical alignment were ensured. This novel assembly enables evanescent field absorption measurements at yet unprecedently harsh conditions, that is, high pressure and temperature. Combining these advantages, this innovative sensor assembly is perfectly suited for taking ATR spectroscopy into the field where the robustness of the assembly and optical alignment is essential.

NANOSTRUCTURED LB FILMS AND EMISSION LIGHT DUE TO MULTIPLE SURFACE PLASMON EXCITATIONS IN THE KRETSCHMANN CONFIGURATION

2002 ◽  
Vol 01 (05n06) ◽  
pp. 409-414
Author(s):  
FUTAO KANEKO ◽  
MITSURU TERAKADO ◽  
TOSHIHARU SATO ◽  
HIROTSUGI HATAKEYAMA ◽  
WATARU SAITO ◽  
...  
Keyword(s):  
Laser Beam ◽  
Surface Plasmon ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Dye Molecules ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Kretschmann Configuration ◽  
Direct Irradiation ◽  
Emission Light

Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/Langmuir–Blodgett (LB) films containing dyes. The emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, i.e., reverse irradiation. The emission intensities depend on the emission angles through the prism, nanostructure of metal and LB films, dye molecules, separation between metal and dye molecules, interactions of dye molecules, etc. The spectra is strongly depended on the emission angles, and the emission light was caused by multiple SP excitations. Nanostructured devices of LB films using SP excitations are described.

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