Researchers at the University of Pennsylvania have created a an optical second-harmonic generator with no background output – second harmonic output can be varied from zero upwards. It consists of an 8μm long strip of cadmium sulphide with source and drain electrodes (one Ohmic, on Schottky) – see diagram. Incoming light was between 680 and ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/optical-modulator-no-output-offset-2018-02/
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