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Modern electronic systems operate in complex electromagnetic environments andmust handle noise and unwanted coupling. The capability to isolate or rejectunwanted signals for mitigating vulnerabilities is critical in any practicalapplication. In this work, we describe the use of a binary programmablemetasurface to (i) control the spatial degrees of freedom for waves propagatinginside an electromagnetic cavity and demonstrate the ability to create nulls inthe transmission coefficient between selected ports; and (ii) create theconditions for coherent perfect absorption. Both objectives are performed atarbitrary frequencies. In the first case a novel and effective optimizationalgorithm is presented that selectively generates coldspots over a singlefrequency band or simultaneously over multiple frequency bands. We show thatthis algorithm is successful with multiple input port configurations andvarying optimization bandwidths. In the second case we establish how thistechnique can be used to establish a multi-port coherent perfect absorptionstate for the cavity.

Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies