A. Leitner

Laser Mössbauer spectroscopy of 229 Th in CaF 2

T. Hiraki, Takahiko Masuda, Sayuri Takatori, Fabian Schaden et autres

Mössbauer spectroscopy is widely used in chemistry, geology, and solid-state physics to probe the local physical and chemical environment of nuclei in materials. Here, we extended this technique into the optical range using a vacuum ultraviolet laser to probe the low-energy nuclear …

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Excitation of Thorium-229 doped in crystals using a pulsed laser toward nuclear clocks

T. Hiraki, Kjeld Beeks, Yuta Fukunaga, Ming Guan et autres

229Th has the uniquely low nuclear first excited state (229 mTh) with the excitation energy of 8.356 eV. This allows excitation using vacuum ultraviolet (VUV) lasers, which opens up the possibility of realizing a clock based on nuclear energy levels, called nuclear …

Excitation of Thorium-229 doped in crystals using a pulsed laser toward nuclear clocks

T. Hiraki, Kjeld Beeks, Yuta Fukunaga, Ming Guan et autres

229 Th has the uniquely low nuclear first excited state ( 229 m Th) with the excitation energy of 8.356 eV. This allows excitation using vacuum ultraviolet (VUV) lasers, which opens up the possibility of realizing a clock based on nuclear energy …

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Characterization of the thorium-229 defect structure in CaF 2 crystals

Sayuri Takatori, Martin Pimon, Stephan Pollitt, Michael Bartokos et autres

Abstract Recent advancements in laser excitation of the low-energy thorium-229 ( 229 Th) nuclear isomeric state in calcium fluoride (CaF 2 ) single crystals render this system a promising candidate for a solid-state nuclear clock. Nonetheless, the precise experimental determination of the …

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Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock

Chuankun Zhang, Tian Ooi, Jacob S. Higgins, Jack F. Doyle et autres

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Controlling 229Th isomeric state population in a VUV transparent crystal

T. Hiraki, Koichi Okai, Michael Bartokos, Kjeld Beeks et autres

Abstract The radioisotope thorium-229 ( 229 Th) is renowned for its extraordinarily low-energy, long-lived nuclear first-excited state. This isomeric state can be excited by vacuum ultraviolet (VUV) lasers and 229 Th has been proposed as a reference transition for ultra-precise nuclear clocks. …

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Frequency ratio of the $^{229\mathrm{m}}$Th nuclear isomeric transition and the $^{87}$Sr atomic clock

Chuankun Zhang, Tian Ooi, Jacob S. Higgins, Jack F. Doyle et autres

Optical atomic clocks$^{1,2}$ use electronic energy levels to precisely keep track of time. A clock based on nuclear energy levels promises a next-generation platform for precision metrology and fundamental physics studies. Thorium-229 nuclei exhibit a uniquely low energy nuclear transition within reach …

Laser Excitation of the Th-229 Nucleus

Johannes Tiedau, Maksim V. Okhapkin, Ke Zhang, Johannes Thielking et autres

The 8.4 eV nuclear isomer state in Th-229 is resonantly excited in Th-doped CaF_{2} crystals using a tabletop tunable laser system. A resonance fluorescence signal is observed in two crystals with different Th-229 dopant concentrations, while it is absent in a control …

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Experimental apparatus for detection of radiative decay of $$^{229}$$Th isomer from Th-doped CaF$$_2$$

T. Hiraki, Kjeld Beeks, Michael Bartokos, Hiroyuki Fujimoto et autres

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Three dimensional sensitivity characterization of plasmonic nanorods for refractometric biosensors

Verena Leitgeb, Andreas Trügler, Stefan Köstler, Markus K. Krug et autres

An experimental three dimensional characterization of the local refractive index sensitivity of plasmonic gold nanorods is performed by controlled apposition of lithographic nanostructures. We show up to seven times higher sensitivity values to local changes in the refractive index at the particle …

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Interference of surface plasmon polaritons excited at hole pairs in thin gold films

V. Häfele, Fernando de León‐Pérez, Andreas Hohenau, Luis Martín-Moreno et autres

The excitation of surface plasmon polaritons by focusing a laser beam onto a hole pair in a thin gold film is studied both experimentally and theoretically. By means of leakage radiation microscopy we quantitatively measure the light-plasmon coupling efficiency as a function …

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Integrated optical attenuator based on mechanical deformation of an elastomer layer

Nicolle Galler, Harald Ditlbacher, Andreas Hohenau, A. Leitner et autres

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