2016 Fiscal Year Annual Research Report
電磁波の動的可視化による次世代ミリ波・テラヘルツ波デバイスの研究
| Project/Area Number |
16J05800
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| Research Institution | Osaka University |
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Principal Investigator |
NGUYEN PHAM HAI HUY 大阪大学, 基礎工学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2016-04-22 – 2018-03-31
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| Keywords | Electro-optic sensor / THz wave visualization / signal-to-noise ratio / detectable bandwidth / Terajet / dielectric cube / subwavelength resolution / THz imaging |
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| Outline of Annual Research Achievements |
Three points were clarified for electric field visualization and its applications.
1) Enhance signal-to-noise ratio (SNR): The DAST crystal was exploited as material of sensors. The SNR achieved by this sensor was 10 dB higher than the conventional ZnTe sensor. The measurement repeatability of DAST sensor was also evaluated and obtained comparable results with ZnTe sensor.
2) Enhance detectable frequency bandwidth: Previously, 100-GHz band was the upper limitation. Now, up to 300 GHz was successfully visualized by employing DAST sensor.
3) Enhance spatial resolution: novel focusing device, based on Terajet generation using a dielectric cube, was characterized for the first time at THz region. The spatial resolution of imaging applications can be enhanced to subwavelength (60% of wavelength).
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The sensitivity and detectable frequency bandwidth of the electric field visualization system (EVS) was significantly enhanced. The DAST crystal exploitation to our unique EVS was successful and obtained 10 dB sensitivity enhancement and 3 times detectable bandwidth from 100-GHz band to 300-GHz band. The novel spatial enhancement device using a dielectric cube based on Terajet generation was successfully characterized at the THz region for the first time. The subwavelength resolution imaging can be expected by this novel device and novel phenomenon. As a result, I attended two conferences and two upcoming international conferences. As the first author, one academic journal (Applied Physics Letters) was published, two journals were submitted. As the coauthor, two journals were published.
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| Strategy for Future Research Activity |
Three points below will be verified in future.
1) Characterize physics of Terajet: Deeper studies of the novel field, Terajet, will be clarified to understand capability for practical applications including nondestructive imaging.
2) Extend detectable bandwidth to 600-GHz band: this band is expected for future practical application including ultra-fast wireless communication and nondestructive imaging. Extend our system to visualize the THz-wave distribution at that frequency band to characterize new devices is necessary. The deeper verification of DAST sensor to know its upper limit of detectable frequency will be clarified.
3) Further enhancement of SNR: as increase THz frequency, THz power decreases gradually. The enhancement of SNR is essential to characterize 600-GHz band THz devices.
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