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Kuwabara K.,Device Innovation Center | Higuchi Y.,Social Device Technology Laboratory | Koizumi H.,Tech Lab Group | Kasahara R.,Device Innovation Center
NTT Technical Review

The flow of blood that circulates through the entire human body and supports life changes dynamically with our emotional and physical state and reveals a huge amount of information. If the flow of blood could be easily visualized in our daily lives, we could expect to see a range of useful applications in areas such as health, beauty, and sports. In this article, we introduce an ultracompact, wearable blood flow sensor that is linked to a smartphone, making it possible to view the flow of blood anywhere and at any time. Source

Ajito K.,Social Device Technology Laboratory | Kim J.-Y.,Social Device Technology Laboratory | Song H.-J.,Social Device Technology Laboratory
NTT Technical Review

We have constructed a continuous wave (CW) terahertz spectroscopy system using photonic integration-compatible technology. This system is intended for use in the medical field as a miniaturized terahertz spectroscopy system, in contrast to the conventional pulsed wave method. This system can simultaneously measure the absorption and phase (dielectric constant) responses of a sample, and it exhibits a dynamic range of at least 75 dB at under 1 THz. In addition, we used the CW spectroscopy system to identify a new type of complex molecule crystal (cocrystal) formed from a molecule of a pharmaceutical drug and various coformers. Cocrystals have been developed for use in the pharmaceutical manufacturing field to improve the solubility and absorbability of medicines. By fixing the measurement frequency at the absorption peak of intermolecular interactions of those crystals, we obtained a two-dimensional distribution of cocrystals within a test tablet. Source

Song H.-J.,Social Device Technology Laboratory | Tajima T.,Social Device Technology Laboratory | Yaita M.,Social Device Technology Laboratory
NTT Technical Review

Advances in medical imaging technology such as computed tomography and magnetic resonance imaging have made it possible to capture minute defects inside the human body. Correspondingly, the volume of such imaging data has been dramatically increasing. There is also a demand to access such medical data using mobile terminal devices. To accommodate this demand, a wireless system with extremely high throughput of 100 Gbit/s or more is essential to enable instant data downloading. In this article, we give an overview of recent progress in terahertz communications, particularly in front-end technologies, which hold high promise for realizing future ultrafast wireless link applications. Source

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