Abstract
The optical control of magnetic flux in superconducting thin-film loops is studied by terahertz radiation imaging. The magnetic flux quanta φ are generated in the loop by illuminating it with femtosecond optical pulses under the bias current IB. The optically generated φ are semiqualitatively evaluated by estimating the amount of the persistent supercurrent circulating along the loop. The threshold and hysteretic characteristics are found in the φ-IB curves, which strongly depend on optical excitation conditions such as laser power and bias current.
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