"In collaboration with the universities of Leuven and Ghent, imec demonstrated efficient light modulation using a thin strontium titanate film (see photo). imec reports that an effective Pockels coefficient of 345 picometers per volt was achieved. The Pockels coefficient indicates the change in refractive index induced by an applied electric field. The higher the coefficient, the more efficiently light can be modulated per volt."
"This demonstration is supplemented by information from a second study, led by a team at Stanford. This study shows that the electro-optical response of strontium titanate can be specifically adjusted and expanded at 4 to 5 Kelvin. In quantum photonics, this property can be used to manipulate light particles (photons) with electrical signals precisely. Applications The breakthrough opens the door to numerous new applications, and imec sees many possibilities within quantum applications."
The Leuven research center imec developed a thin strontium titanate film that enables efficient electro‑optical modulation at cryogenic temperatures around 4 to 5 Kelvin. An effective Pockels coefficient of 345 picometers per volt was measured, indicating strong refractive‑index change per applied electric field and efficient light modulation. Strontium titanate shows low optical losses and improved performance at extreme cold while deteriorating at room temperature. A complementary Stanford-led study demonstrates that the electro‑optical response can be tuned at these temperatures, enabling precise electrical control of photons. Potential applications include quantum interconnects, modulators, and transducers to link superconducting processors with photonic systems.
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