Computational imaging using a mode-mixing cavity at microwave frequencies

Thomas Fromenteze (1) , Okan Yurduseven (2) , Mohammadreza F. Imani (2) , Jonah Gollub (2) , Cyril Decroze (1) , David Carsenat (1) , David R. Smith (2)

1 XLIM-OSA - OSA
2 CMIP

We present a 3D computational imaging system based on a mode-mixing cavity at microwave frequencies. The core component of this system is an electrically large rectangular cavity with one corner re-shaped to catalyze mode mixing, often called a Sinai Billiard. The front side of the cavity is perforated with a grid of periodic apertures that sample the cavity modes and project them into the imaging scene. The radiated fields are scattered by the scene and are measured by low gain probe antennas. The complex radiation patterns generated by the cavity thus encode the scene information onto a set of frequency modes. Assuming the first Born approximation for scattering dynamics, the received signal is processed using computational methods to reconstruct a 3D image of the scene with resolution determined by the diffraction limit. The proposed mode-mixing cavity is simple to fabricate, exhibits low losses, and can generate highly diverse measurement modes. The imaging system demonstrated in this letter can find application in security screening and medical diagnostic imaging.

Domaines: Sciences de l'ingénieur [physics]; Electromagnétisme

Thomas Fromenteze, Okan Yurduseven, Mohammadreza F. Imani, Jonah Gollub, Cyril Decroze, et al.. Computational imaging using a mode-mixing cavity at microwave frequencies. Applied Physics Letters, 2015, ⟨10.1063/1.4921081⟩. ⟨hal-01213865⟩