A noninvasive, painless, and sensitive approach to precise glucose monitoring for ever-increasing diabetics worldwide is critical to reduce the long-term severe complications of diabetes. Recently, wireless sensing in the sub-terahertz and terahertz (THz) bands between 100 GHz and 10 THz opens the door to biosensing and bioimaging for innovative medical applications beyond radar and localization. Here, we report the fingertip blood-free non-invasive glucose monitoring using three-dimensional (3D) eye diagram analysis of THz wireless data to replace current blood finger-stick glucose strips and further realize remote healthcare of THz joint communication and sensing. We demonstrate the accurate estimation of blood glucose concentrations by transmitting a 10 Gbps on-off keying-modulated THz wireless data to a fingertip and measuring a 3D eye diagram of the THz wireless signal reflected from the fingertip. In particular, the method addresses personal variation and sensing accuracy through multivariate analysis of eye parameters including eye height, eye width, Q factor, and probability difference. The experimental results clearly demonstrate that the data waveform is distorted and the probability difference between the logic one and zero levels in the histogram increases in proportion to the glucose concentration. The clinical trial results for THz glucose monitoring clearly show a strong linear correlation between the eye parameters of fingertip and blood glucose concentrations and the consistency between glucose dynamics in blood and fingertip in the oral glucose tolerance test. This approach provides an innovative and effective route for developing daily diabetes management and THz joint sensing and communication.
In this paper, we will demonstrate a photonics-based 300 GHz THz wireless communication with our new-type dual-mode laser(DML) beating light source which is directly modulated at a rate of more than10 Gbps. Also, we verified that using of the DML is superior in terms of stability and linewidth than other technique of photomixing using a two distributed-feedback(DFB) LDs.
This conference presentation, “Waveguide packaged UTC-PD module for terahertz applications” was presented at the Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XV conference at SPIE Photonics West 2022.
In this work, we reported the 1.55 ㎛ ridge-type dual mode laser(R-DML) as a THz communication beating source. It have many advantages of cost effects, compactness and simplification of fabrication by introducing the ridge-type waveguides. We have demonstrated 10Gbps THz wireless communications with 10-3 BER (bit-error-rate) without digital signal processing.
In this study, we report GaAs SBD-based subharmonic mixer for THz communication in the 220-330 GHz band. n GaAs:Si and n++ GaAs:Si were grown on semi-insulating GaAs substrate by using metal-organic chemical vapor deposition. Antiparallel(AP)-SBD was fabricated using the i-line stepper. The schottky junction, defined to be less than 1 um, has been composed of Ti/Pt/Au. The I-V and C-V characteristics of the fabricated AP-SBD were measured for the ideal factor, series resistance, current parameter, junction capacitance and parasitic capacitance. RF matching and LO and IF filters were designed with HFSS capable of 3D electromagnetic wave computational simulation. We also simulated the GaAs subharmonic mixer circuit using the nonlinear analysis of ADS. The conversion loss of the mixer module was measured and compared with the computational simulation results. Finally, we demonstrate the THz communication with 50 Gbps QPSK signal in the 300 GHz band.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.