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Pieter de Visser, Jochem Baselmans , Juan Bueno, Nuria Llombart, Teun Klapwijk SRON

Aluminium Kinetic Inductance Detectors at 1.54 THz limited by photon noise and generation-recombination noise. Pieter de Visser, Jochem Baselmans , Juan Bueno, Nuria Llombart, Teun Klapwijk SRON TU Delft, Faculty of Applied Sciences

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Pieter de Visser, Jochem Baselmans , Juan Bueno, Nuria Llombart, Teun Klapwijk SRON

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  1. Aluminium Kinetic Inductance Detectors at 1.54 THz limited by photon noise and generation-recombination noise Pieter de Visser, Jochem Baselmans, Juan Bueno, Nuria Llombart, Teun Klapwijk SRON TU Delft, Faculty of Applied Sciences TU Delft, Faculty of Electrical Engineering Mathematicsand Computer Siences

  2. Optical Noise Equivalent Power @ 1.54 THz Photon Noise GR - Noise

  3. Operationprinciple Cooper Pairs 2Δ Photons break Cooper pairs => quasiparticles Higherresistanceandkineticinductance Dip depth / amplitude: resistance Resonant frequency / phase: inductance h Day et al, Nature 425, 817 (2003) Quasiparticles

  4. Anticipatedfundamentallimits • KID is a pair breaking detector: fluctuations in the quasiparticle number • Photonnoise (= generationnoise) • Recombinationnoise • Generation-recombinationnoise • Predictionfromdarkexperiments: • NEP of 2 x 10-19 W/Hz1/2limitedby the presence of excess quasiparticles

  5. Design • All Aluminium KID • Central Line: 50 nm Al • Groundplane: 100 nm Al • Halfwave resonator withisolatedcentral strip • X-slot Antenna, broad band around 1.54 THz • 2 mm siliconellipticallenses • Design suitableforhigherfrequencies >1.54 THz

  6. Controlledoptical setup Box-in-box setup 8 optical filters! J. Bueno, Poster 106 (Thursday) Baselmans et al. JLTP 167, 360 (2012)

  7. Large range in optical power

  8. Fundamental limit: PhotonNoise Random arrivalrate of the opticalphotons + recombinationnoise Recombination time scales with as expected Optical Power (fW)

  9. Generation-recombinationnoise Quasiparticle fluctuations De Visser et al. PRL 106, 167004 (2011) Wilson & Prober, PRL, 87, 067004 (2001)

  10. Optical Noise Equivalent Power Photon Noise GR - Noise Photonnoiselimited NEP => Measure of optical efficiency: 48%

  11. Optical responsivity + lifetime: Microwave readout power dependent De Visser et al. APL 100, 162601 (2012) Goldie, SuST, 26, 015004 (2013)

  12. Microwave readout power: Excessquasipartilces AND nonlinearreponseduetoredistribution of quasiparticles arXiv: 1306.4992 Poster 104 (Monday)

  13. Summary • KineticInductance Detector at 1.54 THz • Fundamentalnoise sources for pair breaking detectors revealed: • Photonnoiselimited • Generation-recombinationnoise => excess quasiparticles • NEP 3.8 x 10-19 W/Hz1/2, 48% optical efficiency • Well controlledoptical setup, large power range 1.54 THz experiment - arXiv:1306.4238 Microwave response - arXiv:1306.4992

  14. KID at 1.54 THz Optical efficiency: 48% Photon Noise GR - Noise arXiv:1306.4238

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