Optical Devices

Tunable on-chip optical beam splitter

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Science  18 May 2018:
Vol. 360, Issue 6390, pp. 749-750
DOI: 10.1126/science.360.6390.749-d

Integrated optical approaches potentially offer a robust and compact platform to develop quantum-enhanced sensing and metrology technology. Bishop et al. describe an on-chip beam splitter in which the emission mode can be selected by electromechanically tuning the coupling of two suspended gallium arsenide waveguides. Using a quantum dot as a source of single photons pumped into the input arm of the waveguide, they show that the output port for the emitted photons can be selected by applying a small actuation voltage. Being compact, versatile, and scalable, the technique can be applied to tune other optical components, providing a powerful platform for the fabrication of on-chip quantum optical circuits.

Opt. Lett. 43, 2142 (2018).

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