Terahertz two-pixel imaging based on complementary compressive sensing

In recent years, the advances in terahertz applications have stimulated interest in the biological effects associated with this frequency range. We study the gene expression profile in three types of cells exposed to terahertz radiation, i.e., human ARPE-19 retinal pigment epithelial cells, simian virus 40-transformed human corneal epithelial cells, and human MIO-M1 Müller cells. We find that the gene expression in response to heat shock is unaffected, indicating that the minimum temperature increases under controlled environment. The transcriptome sequencing survey demonstrates that 6-hour irradiation with a broadband terahertz source results in specific change in gene expression and also the biological functions that are closely related to these genes. Our results imply that the effect of terahertz radiation on gene expression can last over 15 hours and depends on the type of cell.

Section: Introductionmentioning

confidence: 99%

Effect of terahertz pulse on gene expression in human eye cells

Zhao

Dong

et al. 2019

“…It can be applied for the optical characterization in a further longwave band. [14][15][16] Meanwhile, due to the high sensitivity and the strong absorption by the water molecules, terahertz measurement is generally performed in a nitrogen ambient. [17][18][19][20] Until now, there have been a few studies carried out based on such water sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of copper sulfate pentahydrate dehydration by terahertz time-domain spectroscopy*

Huang

Hao

et al. 2019

Copper sulfate pentahydrate is investigated by terahertz time-domain spectroscopy. It is shown that the terahertz absorption coefficients are correlated with the particle size of the samples, as well as the heating rates of the ambient temperature. Furthermore, the water molecules of copper sulfate pentahydrate can be quantitatively characterized due to the high sensitivity of the terahertz wave to water molecules. Based on such results, the status of water incorporated in mineral opal is also characterized using terahertz time-domain spectroscopy. It indicates that terahertz technology can be considered as an efficient method to detect the dehydration of minerals.

“…The electromagnetic wave located between the microwaves and infrared region is commonly defined as terahertz (THz) radiation with frequency domain from 0.1 THz to 10 THz. Recently, terahertz radiation has attracted significant attention due to its potential applications in sensing, [1] imaging, [2] time-domain spectroscopy, [3] pharmaceutical drug testing, [4] and communication, [5] etc. However, THz systems that rely on free-space and bulk optics to transport and manipulate the THz radiation are large and immobile, difficult to use and integrate with infrared and optical systems.…”

Section: Introductionmentioning

confidence: 99%

High birefringence, low loss, and flattened dispersion photonic crystal fiber for terahertz application*

Wang

Kong

et al. 2019

A type of photonic crystal fiber based on Kagome lattice cladding and slot air holes in a rectangular core is investigated. Full vector finite element method is used to evaluate the modal and propagation properties of the designed fiber. High birefringence of 0.089 and low effective material loss of 0.055 cm−1 are obtained at 1 THz. The y-polarized fundamental mode of the designed fiber shows a flattened and near-zero dispersion of 0 ± 0.45 ps · THz−1 · cm−1 within a broad frequency range (0.5 THz–1.5 THz). Our results provide the theory basis for applications of the designed fiber in terahertz polarization maintaining systems.