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An optical microresonator with a sharp tungsten tip. Click for more info.
Top: An optical microresonator and a sharp tungsten tip. The tip’s position can control the amount of back reflections in the microresonator. The authors show >30 dB suppression below the intrinsic backscattering. Bottom: The unwanted (intrinsic backscattered) light to the left is cancelled out by the out-of-phase light ("anti-light" similar to "anti-noise" in noise cancelling headphones) introduced by the metal tip. Photos and graphics © Imperial College London.
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