We present the design and experimental demonstration of a single-layer atom chip with an additional wide U-shaped microwire to improve the loading of cold atoms into a magneto-optical trap (MOT). The optimized magnetic-field distribution created by the wide wire increases the trapping volume near the chip while keeping the device…
The paper presents a novel optical microscopy method for directly detecting infectious SARS-CoV-2 viral particles in clinical samples by counting spike proteins on individual virions. Traditional virus detection techniques often measure viral genomes or specific proteins but cannot differentiate between infectious particles and non-infectious debris. We address this limitation by…
We congratulate Anton Afanasiev! His contribution to the development of our city (in promoting science among its residents) has been duly recognized. Anton’s photograph now adorns the city’s Board of Honor in Troitsk.
Junior Researcher of Laser Spectroscopy Department, Aleksey Kalmykov, has successfully defended his PhD dissertation “Ultrahigh Quality Nanoplasmonic Elements and Their Applications“. Scientific advisor – Dr. Viktor Balykin, Chief Research Scientist and Doctor of Physics and Mathematics at ISAN.
The article studies the possibility of creating a compact magneto-optical trap (MOT) for ytterbium atoms by combining an atom chip with a planar diffraction grating. Such a system can simplify traditional laser-cooling setups, which normally require multiple laser beams and large magnetic coils. We experimentally determine the optimal parameters of…
The paper proposes a method for measuring gravitational acceleration using ultracold atoms in an atomic fountain. The technique relies on detecting shifts in Ramsey interference fringes that occur when atoms interact twice with a microwave field during their ballistic motion in the gravitational field. Because the time of flight of…
On February 9, 2024, in Troitsk, the 15th nomination for “Person of the Year” took place. The main ceremony of the city, summarizing the results of the Troitsk year – “Person of the Year”, is dedicated to Russian Science Day. Pavel Melentiev, a leading researcher at ISAN and Doctor of…
On December 12, 2023, a competition of research works by students and postgraduates of ISAN took place in the conference hall of ISAN. Eleven participants competed in this contest. The jury members noted the high level of preparation demonstrated by all participants. Arina Safonova, a first-year master’s student at HSE…
From September 12 to 15, 2023, the International Conference “Laser Physics 2023” was held in Armenia. Darya Bykova presented her talk titled “Measurement of Light-Shift in Rubidium Vapor Microcell” and received a Certificate for Star Student Prize for her oral presentation.
This paper investigate how to efficiently focus a cold atomic beam near an atom chip using a two-dimensional magneto-optical trap (2D MOT). We analyze two regimes of atom–laser interaction: Doppler cooling and sub-Doppler cooling. We show that in the Doppler regime momentum diffusion causes strong heating, so the focusing effect…