Creation of Titania Artificial Interfaces with Geometric Patterns by Using Micro Stereolithography and Aqueous Solution Techniques

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000117-000122
Author(s):  
Soshu Kirihara ◽  
Yousuke Itakura ◽  
Satoko Tasaki
Keyword(s):  
Time Domain ◽  
Anatase Phase ◽  
Far Infrared ◽  
Terahertz Wave ◽  
Terahertz Waves ◽  
Glass Substrates ◽  
Geometric Patterns ◽  
Water Solvent ◽  
Micro Patterning ◽  
Geometric Arrangements

Titania micro patterns with periodic arrangements were formed on glass substrates successfully for electromagnetic wave energy resonations and localizations in terahertz frequency ranges. Geometric arrangements of acryl polygon tablets with titania particles dispersions by using micro patterning stereolithography. Moreover, periodically arranged full titania tablets with anatase phase were created homogeneously though liquid phase crystal depositions of water solvent processes under micro templates fabricated by using the stereolithography system. The terahertz wave properties were measured and simulated by a using time domain spectroscopic system and finite difference time domain method. The terahertz waves having micrometer order wavelengths and belonging in far-infrared frequency ranges are expected to apply for various types of novel sensors which can detect micro cracks on materials surfaces, micro defects in electric devices, bacteria in foods, and cancer cells in human skins.

Terahertz Time-Domain Spectroscopy Technology and its Application in the Field of Pesticide

2013 ◽  
Vol 561 ◽  
pp. 640-645
Author(s):  
Yi Hu Huang ◽  
Man Hu ◽  
Gui Hua He ◽  
Wen Long Liu
Keyword(s):  
Time Domain ◽  
Information Science ◽  
Far Infrared ◽  
Terahertz Wave ◽  
Electromagnetic Spectrum ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

Terahertz wave lies between far-infrared and microwave in electromagnetic spectrum with frequency form 0.1 THz to10 THz. Terahertz is believed to be the master technology of electronics and information science, and to be the bridge between micro electronics and macro wavelength. THz has formed a worldwide research climax. This paper introduces the main characters of Terahertz wave, Terahertz time-domain spectroscopy technology and its application researches, especially detailed the researches in pesticide spectra.

scholarly journals Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets

2015 ◽  
Vol 62 ◽  
pp. 10-14
Author(s):  
Kaori Yano ◽  
Toshiaki Hattori
Keyword(s):  
Time Domain ◽  
Signal To Noise Ratio ◽  
Laser Pulses ◽  
Terahertz Wave ◽  
Femtosecond Laser Pulses ◽  
Terahertz Waves ◽  
Terahertz Time Domain Spectroscopy ◽  
Wave Source ◽  
Time Domain Spectroscopy ◽  
Neodymium Magnets

The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. The emitter is composed of an InAs wafer and two neodymium magnets. The emitter was irradiated by femtosecond laser pulses. The data quality of terahertz spectroscopic measurements was evaluated, and reduction of error in the data obtained due to the terahertz power enhancement was observed.

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

Study on Detection of Insulator Defects in Time Domain Terahertz Wave

2018 ◽  
Author(s):  
Rui Wang ◽  
Zhonghao Zhang ◽  
Cuiru Yang ◽  
Zhangxiang Nie ◽  
Liming Wang ◽  
...  
Keyword(s):  
Time Domain ◽  
Terahertz Wave

scholarly journals Time Domain Spectroscopy/Imaging and Wireless Data Transfer Technologies with Terahertz Wave

2010 ◽  
Vol 19 (3) ◽  
pp. 12
Author(s):  
Mun Cheol PAEK ◽  
Min Hwan KWAK ◽  
Sungil KIM ◽  
Seung Beom KANG ◽  
Hancheol RYU ◽  
...  
Keyword(s):  
Time Domain ◽  
Data Transfer ◽  
Terahertz Wave ◽  
Wireless Data ◽  
Time Domain Spectroscopy

scholarly journals A simple developmental model recapitulates complex insect wing venation patterns

2018 ◽  
Vol 115 (40) ◽  
pp. 9905-9910 ◽  
Author(s):  
Jordan Hoffmann ◽  
Seth Donoughe ◽  
Kathy Li ◽  
Mary K. Salcedo ◽  
Chris H. Rycroft
Keyword(s):  
Large Scale ◽  
Developmental Model ◽  
Wing Venation ◽  
Secondary Vein ◽  
Insect Wing ◽  
Geometric Patterns ◽  
Insect Wings ◽  
Left And Right ◽  
Vein Patterning ◽  
Geometric Arrangements

Insect wings are typically supported by thickened struts called veins. These veins form diverse geometric patterns across insects. For many insect species, even the left and right wings from the same individual have veins with unique topological arrangements, and little is known about how these patterns form. We present a large-scale quantitative study of the fingerprint-like “secondary veins.” We compile a dataset of wings from 232 species and 17 families from the order Odonata (dragonflies and damselflies), a group with particularly elaborate vein patterns. We characterize the geometric arrangements of veins and develop a simple model of secondary vein patterning. We show that our model is capable of recapitulating the vein geometries of species from other, distantly related winged insect clades.

Properties of Bi and BiSb Nano-Dimensional Layers in Thz Frequency Range

2020 ◽  
Vol 312 ◽  
pp. 206-212
Author(s):  
Ivan L. Tkhorzhevskiy ◽  
Anton D. Zaitsev ◽  
Petr S. Demchenko ◽  
Dmitry V. Zykov ◽  
Aleksei V. Asach ◽  
...  
Keyword(s):  
Phase Shift ◽  
Time Domain ◽  
Terahertz Wave ◽  
Film Structure ◽  
Charge Carriers ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Antimony Content ◽  
Mobility Of Charge Carriers ◽  
Substrate Film

In the present paper we demonstrate and compare different properties of Bi and Bi1-xSbx thin films placed on polyimide (PI) substrate in frequency range from 0.2 to 1.0 THz. Bi films with a thickness of 40, 105 and 150 nm have been studied as well as 150 nm Bi1-xSbx solid solutions with Sb concentration of 5, 8, 12 and 15 %. An effective refractive index and permittivity of whole substrate/film structures have been derived by using terahertz time-domain spectroscopy (THz-TDS) method. These measurements have shown the positive phase shift in PI substrate with a thickness of 42 μm and revealed that it is barely transparent in studied frequency range, but the whole substrate/film structure provides the negative phase shift of terahertz wave. It was shown that the permittivity depends on mobility of charge carriers which is driven by film thickness and antimony content.

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