Three-dimensional terahertz imaging using an amplitude-modulated resonant-tunneling-diode oscillator

2021 ◽  
Author(s):  
Adrian Dobroiu ◽  
Kotaro Asama ◽  
Safumi Suzuki ◽  
Masahiro Asada ◽  
Hiroshi Ito
Keyword(s):  
Resonant Tunneling ◽  
Three Dimensional ◽  
Terahertz Imaging ◽  
Resonant Tunneling Diode ◽  
Tunneling Diode ◽  
Diode Oscillator

A quasioptical resonant-tunneling-diode oscillator operating above 200 GHz

1993 ◽  
Vol 41 (4) ◽  
pp. 720-722 ◽  
Author(s):  
E.R. Brown ◽  
C.D. Parker ◽  
A.R. Calawa ◽  
M.J. Manfra ◽  
K.M. Molvar
Keyword(s):  
Resonant Tunneling ◽  
Resonant Tunneling Diode ◽  
Tunneling Diode ◽  
Diode Oscillator

scholarly journals Absolute and Precise Terahertz-Wave Radar Based on an Amplitude-Modulated Resonant-Tunneling-Diode Oscillator

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 52 ◽  
Author(s):  
Adrian Dobroiu ◽  
Ryotaka Wakasugi ◽  
Yusuke Shirakawa ◽  
Safumi Suzuki ◽  
Masahiro Asada
Keyword(s):  
Resonant Tunneling ◽  
Modulation Frequency ◽  
Propagation Distance ◽  
Sine Wave ◽  
Terahertz Wave ◽  
Resonant Tunneling Diode ◽  
Tunneling Diode ◽  
Wave Radar ◽  
Diode Oscillator ◽  
Modulation Signal

We present the principle of a terahertz-wave radar and its proof-of-concept experimental verification. The radar is based on a 522 GHz resonant-tunneling-diode oscillator, whose terahertz output power can be easily modulated by superimposing the modulation signal on its bias voltage. By using one modulation frequency and measuring the time delay of the returning signal, a relative measurement of the propagation distance is possible; adding a second modulation frequency removes the ambiguity stemming from the periodicity of the modulation sine wave and allows an absolute distance measurement. We verified this measurement method experimentally and obtained a submillimeter precision, as predicted by theory.

scholarly journals Subcarrier Frequency-Modulated Continuous-Wave Radar in the Terahertz Range Based on a Resonant-Tunneling-Diode Oscillator

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6848
Author(s):  
Adrian Dobroiu ◽  
Yusuke Shirakawa ◽  
Safumi Suzuki ◽  
Masahiro Asada ◽  
Hiroshi Ito
Keyword(s):  
Resonant Tunneling ◽  
Continuous Wave ◽  
Terahertz Wave ◽  
Resonant Tunneling Diode ◽  
Proof Of Concept ◽  
Fmcw Radar ◽  
Tunneling Diode ◽  
Wave Radar ◽  
Diode Oscillator ◽  
Wave Range

We introduce a new principle for distance measurement in the terahertz-wave range using a resonant-tunneling-diode (RTD) oscillator as a source at 511 GHz and relying on the frequency-modulated continuous-wave (FMCW) radar technique. Unlike the usual FMCW radar, where the sawtooth frequency modulation is applied to the carrier, we propose applying it to a subcarrier obtained by amplitude modulation; this is advantageous when the source cannot be controlled precisely in oscillation frequency, but can easily be modulated in amplitude, as is the case of the RTD oscillator. The detailed principle and a series of proof-of-concept experimental results are presented.

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