Partnership - BETSA® - All for very high pressure experiments

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Even more...
A collaboration between BETSA® and the UCBL
A NEW "NANO" Membrane Diamond Anvil Cell is available,
to achieve a new objective, a minimal working distance, a lightness and a maximized angular opening.

This NANO MDAC has been developed by the UCBL and now available in partnership sign with BETSA® Company.
Ultra-flat membrane diamond anvil cell
developed for SMS high-pressure experiments.
Exceptionally close working distance.

Cell with short working distance

Lens acquisition capability adapted to have a laser spot size without aberration

so keep the original laser spot size on the sample

adapted for infrared spectro (to work with Cassegrain reflective optics)

or other measures with objectives before and / or after cell with short working distance.

With small working distance, it allows to use lenses with large numerical apertures and thus to collect a maximum of signal
very suitable then for very small samples (even for individual nano-objects as in the article) or samples that give a weak signal.
Diamond anvil cell description:
(a) The cell body, piston and gas-membrane hood (in yellow, green and magenta colors respectively)
The central part of the cell is constituted by the perforated metallic gasket (D) determining together with the two diamond anvils (C and F) the sample cavity. The two diamond anvils were supported by tungsten carbide (CW) seats (B and E).

Axial alignment of the diamond anvils is made possible by the adjustments in the superior CW seat (B), whereas parallelism between the two diamond anvil culets is obtained by the tilt of the lower CW seat (E). The whole cell (≈ 5 cm diameter) was designed to allow the extreme close-up approach of two optical objectives (A and G) on both sides. Accessible working distances (WD) and optical angular aperture are both indicated in the drawing. The finite element analysis allowed to verify the correct mechanical response of the cell up to pressures of at least 10 GPa, as well as to optimize the geometry with the goal of reducing the working distance of the optical objectives.

(b) Perspective cut of the cell inserted in the piezoelectric transducer system: the cell is tightly fixed to a support coupled to the piezoelectric linear actuator (H, in red) allowing for stable 1 kHz range oscillations between the fixed objectives.
High-Pressure Effect on the Optical Extinction
of a Single Gold Nanoparticle
Fabio Medeghini, Mike Hettich,† Romain Rouxel, Silvio D. Silva Santos, Sylvain Hermelin,Etienne Pertreux, Abraao Torres Dias,‡ Franck Legrand,§ Paolo Maioli, Aurélien Crut, Fabrice Vallée, Alfonso San Miguel, and Natalia Del Fatti* Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière, 69622 Villeurbanne Cedex, France

When reducing the size of a material from bulk down to nanoscale, the enhanced surface-to-volume ratio and the presence of interfaces make the properties of nano-objects very sensitive not only to confinement effects but also to their local environment. In the optical domain, the latter dependence can be exploited to tune the plasmonic response of metal nanoparticles by controlling their surroundings, notably applying high pressures. To date, only a few optical absorption experiments have demonstrated this feasibility, on ensembles of metal nanoparticles in a diamond anvil cell. Here, we report a nontrivial combination between a spatial modulation spectroscopy microscope and an ultraflat diamond anvil cell, allowing us to quantitatively investigate the high-pressure optical extinction spectrum of an individual nano-object. A large tuning of the surface plasmon resonance of a gold nanobipyramid is experimentally demonstrated up to 10 GPa, in quantitative agreement with finite-element simulations and an analytical model disentangling the impact of metal and local environment dielectric modifications. High-pressure optical characterizations of single nanoparticles allow for the accurate investigation and modeling of size, strain, and environment effects on physical properties of nano-objects and also enable fine-tuned applications in nanocomposites, nanoelectromechanical systems, or nanosensing devices.
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