Active terahertz time differentiator using piezoelectric micromachined ultrasonic transducer array

The rapid growth of information technology is closely linked to our ability to modulate and demodulate a signal, whether in the frequency or in the time domain. Recent demonstrations of terahertz (THz) modulation involve active semiconductor metamaterial surfaces or use of a grating-based micromirro...

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Bibliographic Details
Published in:Optics letters 2020-07, Vol.45 (13), p.3589-3592
Main Authors: Amirkhan, F, Robichaud, A, Ropagnol, X, Gratuze, M, Ozaki, T, Nabki, F, Blanchard, F
Format: Article
Language:English
Subjects:
Arrays
Broadband
Differentiators
Electric communication systems
Frequencies
Metamaterials
Micromachining
Piezoelectricity
Terahertz frequencies
Ultrasonic transducers
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Summary:The rapid growth of information technology is closely linked to our ability to modulate and demodulate a signal, whether in the frequency or in the time domain. Recent demonstrations of terahertz (THz) modulation involve active semiconductor metamaterial surfaces or use of a grating-based micromirror for frequency offset tuning. However, a wideband and active differentiator in the THz frequency band is yet to be demonstrated. Here, we propose a simple method to differentiate a THz pulse by inducing tiny phase changes on the THz beam path using a piezoelectric micromachined ultrasonic transducer array. We precisely demonstrate that the modulated THz signal detected after the piezoelectric device is proportional to the first-order derivative of the THz pulse. The proposed technique will be able to support a wide range of THz applications, such as peak detection schemes for telecommunication systems.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.393917