Flying Particle Thermosensor in Hollow-Core Fiber Based on Fluorescence Lifetime Measurements
Jasper Freitag,
Max Koeppel,
Maria N. Romodina,
Nicolas Joly,
Bernhard Schmauß
IEEE Journal of Selected Topics in Quantum Electronics
30
(6)
5600409
(2023)
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Thermosensitive fluorescence lifetime measurements enable accurate thermometry independent of intensity fluctuations along the optical path. Here, we report lifetime-based temperature measurements of a single europium-doped particle optically trapped in an air-filled hollow-core fiber. A frequency-domain fluorescence lifetime measurement setup was integrated into a dual-beam optical trap. The measured apparent lifetime shows a linear temperature dependence of −1.8 µs/K for excitation at 400Hz . The results were repeatable over multiple cooling and heating cycles. In addition to temperature sensing, the influence of the high-power trapping laser on the measured apparent lifetime and fluorescence intensity was investigated. The observed laser-induced particle heating can be exploited to increase the fluorophore's sensitivity and operating range for low-temperature sensing. Fluorescence lifetime measurements of optically trapped particles inside a hollow-core fiber are promising for temperature sensing with micrometer spatial resolution over meter-scale distances.
Experimental Optical Simulator of Reconfigurable and Complex Quantum Environment
P. Renault,
J. Nokkala,
G. Roeland,
Nicolas Y. Joly,
R. Zambrini,
S. Maniscalco,
J. Piilo,
N. Treps,
V. Parigi
No quantum system can be considered totally isolated from its environment. In most cases the interaction between the system of interest and the external degrees of freedom deeply changes its dynamics, as described by open quantum system theory. Nevertheless engineered environment can be turned into beneficial effects for some quantum information tasks. Here we demonstrate an optical simulator of a quantum system coupled to an arbitrary and reconfigurable environment built as a complex network of quantum interacting systems. We experimentally retrieve typical features of open quantum system dynamics like the spectral density and quantum non-Markovianity, by exploiting squeezing and entanglement correlation of a continuous-variable optical platform. This opens the way to the experimental tests of open quantum systems in reconfigurable environments that are relevant in, among others, quantum information, quantum thermodynamics, quantum transport, and quantum synchronization.
Low-noise supercontinuum generation in chiral all-normal dispersion photonic crystal fibers
Markus Lippl,
Michael H. Frosz,
Nicolas Y. Joly
Optics Letters
48
(20)
5297-5300
(2023)
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We present the advantages of supercontinuum generation in chiral, therefore circularly birefringent, all-normal dispersion fibers. Due to the absence of nonlinear power transfer between the polarization eigenstates of the fiber, chiral all-normal dispersion fibers do not exhibit any polarization instabilities and thus are an ideal platform for a low-noise supercontinuum generation. By pumping a chiral all-normal dispersion fiber at 802 nm, we obtained an octave-spanning, robustly circularly polarized supercontinuum with a low noise.
Tunable fiber source of entangled UV-C and infrared photons
Santiago López-Huidrobro,
Noureddin Mohammad,
Maria V. Chekhova,
Nicolas Y. Joly
Pairs of entangled photons—biphotons—are indispensable in quantum applications. However, some important spectral ranges, like the ultraviolet, have been inaccessible to them so far. Here, we use four-wave mixing in a xenon-filled single-ring photonic crystal fiber to generate biphotons with one of the photons in the ultraviolet and its entangled partner in the infrared spectral range. We tune the biphotons in frequency by varying the gas pressure inside the fiber and thus tailoring the fiber dispersion landscape. The ultraviolet photons are tunable from 271 nm to 231 nm and their entangled partners, from 764 nm to 1500 nm, respectively. Tunability up to 192 THz is achieved by adjusting the gas pressure by only 0.68 bar. At 1.43 bar, the photons of a pair are separated by more than 2 octaves. The access to ultraviolet wavelengths opens the possibility for spectroscopy and sensing with undetected photons in this spectral range.
Single-pulse terahertz spectroscopy monitoring sub-millisecond time dynamics at a rate of 50 kHz
Nicolas Couture,
Wei Cui,
Markus Lippl,
Rachel Ostic,
Defi Junior Jubgang Fandio,
Eeswar Kumar Yalavarthi,
Aswin Vishnuradhan,
Angela Gamouras,
Nicolas Y. Joly, et al.
Nature Communications
14
(1)
2595
(2023)
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Slow motion movies allow us to see intricate details of the mechanical dynamics of complex phenomena. If the images in each frame are replaced by terahertz (THz) waves, such movies can monitor low-energy resonances and reveal fast structural or chemical transitions. Here, we combine THz spectroscopy as a non-invasive optical probe with a real-time monitoring technique to demonstrate the ability to resolve non-reproducible phenomena at 50k frames per second, extracting each of the generated THz waveforms every 20 μs. The concept, based on a photonic time-stretch technique to achieve unprecedented data acquisition speeds, is demonstrated by monitoring sub-millisecond dynamics of hot carriers injected in silicon by successive resonant pulses as a saturation density is established. Our experimental configuration will play a crucial role in revealing fast irreversible physical and chemical processes at THz frequencies with microsecond resolution to enable new applications in fundamental research as well as in industry.<br><br>
Measurement of Minute Liquid Volumes of Chiral Molecules Using In-Fiber Polarimetry
Florian Schorn,
Arabella Essert,
Yu Zhong,
Sahib Abdullayev,
Kathrin Castiglione,
Marco Haumann,
Nicolas Y. Joly
Analytical Chemistry
95
3204-3209
(2023)
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We report an optofluidic method that enables to efficiently measure the enantiomeric excess of chiral molecules at low concentrations. The approach is to monitor the optical activity induced by a Kagome-lattice hollow core photonic crystal fiber filled with a sub-mu L volume of chiral compounds. The technique also allows monitoring the enzymatic racemization of Rmandelic acid.
Contact
Research Group Nicolas Joly
Professor for Photonics Friedrich-Alexander-Universität Erlangen-Nürnberg
and
Max Planck Institute for the Science of Light Staudtstr. 2 91058 Erlangen, Germany
