Archives October 2025

Rydberg electromagnetically induced85transparency of Rb vapor in Ar, Ne, and N gases

Bineet Dash,Nithiwadee Thaicharoen,Eric Paradis,Alisher Duspayev,and Georg Raithel

https://doi.org/10.1063/5.0237759

APL Quantum 2, 016132 (2025)

ABSTRACT
An experimental study on Rydberg electromagnetically induced transparency (EIT) in rubidium (Rb) vapor cells containing inert gases at pressures ≤5 Torr is reported. Using an inert-gas-free Rb vapor cell as a reference, we measure frequency shift and line broadening of the EIT spectra in Rb vapor cells with argon, neon, or nitrogen gases at pressures ranging from a few mTorr to 5 Torr. The results qualitatively 18 October 2025 11:50:48
agree with a pseudo-potential model that includes s-wave scattering between the Rydberg electron and the inert-gas atoms and the effect of polarization of the inert-gas atoms by the Rydberg atoms. Our results are important for establishing Rydberg-EIT as an all-optical and non-intrusive spectroscopic probe for eld diagnostics in low-pressure radio frequency discharges.

FIG. 1. (a) Energy levels of 85Rb used in our experiment. The probe laser (λp = 780 nm) is locked to the 5S1/2,
F = 3 ↔ 5P3/2, F′ = 4 resonance, and the coupling laser is scanned across the5P3/2 ↔ 36D5/2 transition.(b)Experimental setup. Some elements are omitted for simplicity.

Dual-Parameter Surface Plasmon Resonance Photonic Crystal Fiber Sensor for Simultaneous Magnetic Field and Temperature Detection with Potential SERS Applications

by Haoran Wang ,Shiwei Liu,Wenzhao Liu and Shuai Wang 

https://doi.org/10.3390/photonics12040355

This article belongs to the Special Issue Research, Development and Application of Raman Scattering Technology

Abstract

A high-sensitivity surface plasmon resonance (SPR) dual-parameter sensor based on photonic crystal fiber (PCF) is proposed for simultaneous measurement of magnetic field and temperature. The grooves on the right and upper sides of the PCF, serving as distinct detection channels, are filled with magnetic fluid and polydimethylsiloxane, respectively, enabling high-sensitivity detection of magnetic field and temperature. The structure parameters and sensing characteristics of the proposed sensor are investigated based on the finite element method. Numerical results indicate, within the wavelength range of 850–1050 nm, that the sensor achieves a high magnetic field sensitivity of 86 pm/Gs under x-polarization in the range of 100–600 Gs, and exhibits a temperature sensitivity of −2.63 nm/°C under y-polarization within the temperature range of 20–40 °C. Furthermore, the detection precision and applicability of the sensor in actual measurement applications could be further enhanced in the future by introducing surface-enhanced Raman scattering technology.

Figure . Schematic illustration of the cross-sectional view of the proposed dual-channel SPR-PCF sensor.