X-ray Resonance in Crystal Cavities--Realization of Fabry-Perot Resonator for Hard X-rays

TL;DR

This paper demonstrates the realization of a Fabry-Perot resonator for hard X-rays using monolithic silicon crystal plates, revealing resonance fringes due to coherent wavefield interaction, with implications for advanced X-ray optics.

Contribution

It introduces a novel X-ray cavity resonator based on silicon crystal plates, enabling high-resolution and phase-contrast X-ray applications.

Findings

Resonance fringes observed inside the energy gap.

Coherent interaction between X-ray wavefields confirmed.

Potential for new X-ray optical developments.

Abstract

X-ray back diffraction from monolithic two silicon crystal plates of 25--150 um thick and a 40--150 um gap using synchrotron radiation of energy resolution deltaE=0.36 meV at 14.4388 keV shows clearly resonance fringes inside the energy gap and the total-reflection range for the (12 4 0) reflection. This cavity resonance results from the coherent interaction between the X-ray wavefields generated by the two plates with a gap smaller than the X-ray coherence length. This finding opens up new opportunities for high-resolution and phase-contrast X-ray studies, and may lead to new developments in X-ray optics.