In terahertz system design, the integration of reconfigurable components, and especially switches, is indispensable for routing terahertz signal flow. While on-off switching in the terahertz range has been demonstrated in various topologies, the realization of 1-to-N switching has remained unexplored. This significant gap in dynamically reconfigurable routing capabilities has fundamentally limited the achievable complexity of terahertz systems. To address this, we present 1-to-N switches using cascaded disk resonators in an integrated substrateless silicon waveguide platform. These switches are individually controlled through photoexcitation, achieved by directing a low-power 658-nm laser onto the disk resonator. This action suppresses the resonance and impedes signal coupling into a specific output port. Furthermore, we integrate a 1-to-3 switch monolithically together with a Luneburg lens to realize beam switching. This integration is a major step in terahertz technology, as it is the first demonstration of dynamic reconfigurable beam control in a low-loss terahertz integration platform, opening up promising possibilities for sensing, imaging, and communications.
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