Bibliographic Details
| Title: |
Bragg resonator cavity for time-resolved microwave conductivity measurement. |
| Authors: |
Ghaddar, A.1 ali.ghaddar@univ-littoral.fr, Boutghatin, M.2, Ropa, P.1, Toufaily, M.1, Khol, B.3, Saitzek, S.3, Blach, J.-F.3, Tentillier, N.1, Douali, R.1 |
| Source: |
Journal of Applied Physics. 9/28/2026, Vol. 140 Issue 12, p1-14. 14p. |
| Subject Terms: |
*Time-resolved microwave conductivity, *Charge carriers, *Laser pulses, *Fused silica, *Band gaps |
| Abstract: |
Time-resolved microwave conductivity (TRMC) is a well-established technique for characterizing charge carriers in materials. This technique relies on a sensitive resonant microwave cavity to detect small changes in the material's conductivity induced by a laser pulse. Conventional TRMC systems typically employ iris-coupled resonant cavities. In this work, we present a systematic theoretical, numerical, and experimental study aimed at integrating a Bragg-resonator-based cavity into TRMC measurements. First, we optimize the multilayer structure, composed of silica glass and air, inside the rectangular waveguide operating in the Ka-band, in order to bring the bandgap into our operating frequency range. Next, we introduce a defect into the structure, which induces resonance within the bandgap. At the resonance frequency, the electric field is strongly confined within the defect region, creating a highly sensitive area for TRMC measurements. Then, the position of a substrate containing a thin film is optimized by calculating the sensitivity factor both theoretically and numerically. The experimental characterization of the proposed cavity presents a good convenient with theoretical and simulation result. Finally, TRMC measurements were carried out using the Bragg resonator cavity, and a clear signal attributed to charge excitation was obtained. This opens new perspectives for the use of Bragg cavities in TRMC, by taking advantage of their strong field confinement. [ABSTRACT FROM AUTHOR] |
| Database: |
Academic Search Index |