reflection geometry
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2021 ◽  
Vol 60 (29) ◽  
pp. 9042
Author(s):  
Thomas M. Koller ◽  
Junwei Cui ◽  
Michael Schmidt ◽  
Johannes Knorr ◽  
Andreas P. Fröba

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongfei Zhang ◽  
Yuanmeng Zhao ◽  
Chenyu Li ◽  
Cunlin Zhang

Chinese lacquerware is an important invention of arts and crafts in China. In this study, Chinese lacquerware is characterized using terahertz reflectometric imaging. The lacquerware studied herein comprises an ornamental wood panel covered by multiple layers of lacquers to portray motifs. For characterizing lacquerware, a terahertz time-domain spectroscopic reflectometric imaging system is proposed. The role of the proposed terahertz imaging system in highlighting the interface between layers during stratigraphic buildup in reflection geometry is proved. The proposed system provides a universal method for assessing the structural information of lacquered objects in a contactless and non-invasive manner; moreover, it provides two-dimensional images, subsurface three-dimensional images, and stratigraphic images (b-scans) in a contactless and non-invasive manner. Using the proposed system, we examine the buried layers of the lacquerware, including faults in the wooden layer and damages in the lacquerware. Research shows the promising prospects of terahertz time-domain spectroscopic reflectometric imaging as a non-destructive detection technique suited to lacquerware.


2021 ◽  
Vol 14 (2) ◽  
pp. 44-51
Author(s):  
Xudong Liu ◽  
Hao Chen ◽  
Teng Li ◽  
Yiwen Sun

Terahertz modulators with capability of both intensity and phase are essential for THz imaging and communication systems. The low-voltage driven THz modulation technique is crucial for integrating the modulators with electronics components. There is still a lack of broadband devices able to achieve both amplitude and phase modulation with low voltage, due to the underlying physics behind existing approaches. Here, we demonstrate a graphene-loaded metal wire grating THz modulator in the total internal reflection geometry to achieve intensity modulation of 80% and phase modulation of 70 degree within 3 volts gate voltage. Quite different from using the strategy of metamaterials based on the electromagnetic resonance effects, our design has performed a broadband modulation for over 1 THz bandwidth.


Author(s):  
Karim‐Alexandros Kantre ◽  
Marcos V. Moro ◽  
Valentina Paneta ◽  
Daniel Primetzhofer

2021 ◽  
Author(s):  
J. K. Asane ◽  
Md G. R. Chowdhury ◽  
K. M. Khabir ◽  
V. A. Podolskiy ◽  
M. A. Noginov

The Analyst ◽  
2021 ◽  
Author(s):  
Uvinduni I. Premadasa ◽  
Amber N. Bible ◽  
Jennifer L Morrell-Falvey ◽  
Benjamin Doughty ◽  
Yingzhong Ma

Nonlinear optical microscopy that leverages an objective based total internal reflection (TIR) excitation scheme is an attractive means for rapid, wide-field imaging with enhanced surface sensitivity. Through select combinations of...


2021 ◽  
Vol 92 (1) ◽  
pp. 013902
Author(s):  
A. Denoeud ◽  
J.-A. Hernandez ◽  
T. Vinci ◽  
A. Benuzzi-Mounaix ◽  
S. Brygoo ◽  
...  

Author(s):  
Lauren E. Barr ◽  
Peter Karlsen ◽  
Samuel H. Hornett ◽  
Ian R. Hooper ◽  
Christopher R. Lawrence ◽  
...  

2020 ◽  
Vol 28 (23) ◽  
pp. 34320
Author(s):  
Gergö o Krizsán ◽  
Zoltán Tibai ◽  
János Hebling ◽  
László Pálfalvi ◽  
Gábor Almási ◽  
...  

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