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Einstein's general theory of relativity not only revolutionized humanunderstanding of the universe, but also brought many gravitational applicationsin large scale, such as gravitational-wave astronomy, gravitational lensing,and the operation of the global positioning system. However, it still remains achallenge to implement applications for gravitational effects at small spacialextensions on Earth. Here, we investigate a structured waveguide system thatallows for the control of an x-ray profile at altitude separations ofmillimeters and even shorter using the nuclear resonant scattering of x rays.Our present results suggest a potential compact scheme for turning the Earth'sgravity into a practical application of x-ray optics.

Gravitationally sensitive structured x-ray optics using nuclear resonances