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Séminaire MCBT Exceptionnel

Mercredi 19 décembre à 14h00,
Salle Louis Weil, E424

Orateur : Gregoire Coiffard (UC Santa Barbara)
"Microwave Kinetic Inductance Detectors for Optical to Near-IR Astronomy"

Abstract

Microwave Kinetic Inductance Detectors (MKIDs) are superconducting detectors that can measure the energy and arrival time of individual optical through near-IR photons without read noise or dark counts. I will discuss our recent work on the fabrication and results of the 20,000 pixels MEC array (MKIDs Exoplanet Camera) now installed on the Subaru telescope (Mauna Kea, Hawaii). I will show that the use of platinum silicide (PtSi) allows very sensitive array to be fabricated ; we measured energy resolution R 10 at 1 um. I will present three different approaches all intended to further increase the performance over standard MKIDs. First, I will talk about our recent work on optical coating that increases the quantum efficiency of the detectors. The PtSi sensitive area of the detectors are covered with a SiO2/Ta2O5 bi-layer in order to reduce the reflection of optical photons hitting the detectors. Second, I will discuss the work we are doing on low transition temperature, Tc, resonators. We are working on the fabrication of hafnium (Tc < 450 mK) detectors which has a much lower Tc than the PtSi (Tc 980 mK) usually used. Third, I will introduce a novel parallel plate capacitor MKID geometry. We have proven that this design allows the resonators to be driven at higher power and we are now working on a second design based on a Hf/HfO2/Nb tri-layer deposited in-situ.

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