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New method centres quantum dots inside photonic chips with 20nm accuracy

NIST quantum dot alignment

Illustration depicting how a quantum dot centered in the optical 'hotspot' of a circular grating (centre dot in the inset) emits more light than a dot that is misaligned (off-centre dot in the inset). Image: S Kelley/NIST

Using microscopy, NIST researchers were able to correct the positions of many individual quantum dots, standards and calibrations for optical microscopes that allow quantum dots to be aligned with the centre of a photonic component

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