Experimental setup for investigation of nanoclusters at cryogenic temperatures by electron spin resonance and optical spectroscopies

2014 ◽  
Vol 85 (7) ◽  
pp. 073906 ◽  
Author(s):  
S. Mao ◽  
A. Meraki ◽  
P. T. McColgan ◽  
V. Shemelin ◽  
V. V. Khmelenko ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Experimental Setup ◽  
Cryogenic Temperatures ◽  
Spin Resonance

scholarly journals On the modeling of amplitude-sensitive electron spin resonance (ESR) detection using voltage-controlled oscillator (VCO)-based ESR-on-a-chip detectors

2021 ◽  
Vol 2 (2) ◽  
pp. 699-713
Author(s):  
Anh Chu ◽  
Benedikt Schlecker ◽  
Michal Kern ◽  
Justin L. Goodsell ◽  
Alexander Angerhofer ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Limit Of Detection ◽  
Oscillation Amplitude ◽  
Stochastic Averaging ◽  
Closed Form Expression ◽  
Experimental Setup ◽  
Voltage Controlled Oscillator ◽  
Depth Analysis ◽  
Spin Resonance

Abstract. In this paper, we present an in-depth analysis of a voltage-controlled oscillator (VCO)-based sensing method for electron spin resonance (ESR) spectroscopy, which greatly simplifies the experimental setup compared to conventional detection schemes. In contrast to our previous oscillator-based ESR detectors, where the ESR signal was encoded in the oscillation frequency, in the amplitude-sensitive method, the ESR signal is sensed as a change of the oscillation amplitude of the VCO. Therefore, using VCO architecture with a built-in amplitude demodulation scheme, the experimental setup reduces to a single permanent magnet in combination with a few inexpensive electronic components. We present a theoretical analysis of the achievable limit of detection, which uses perturbation-theory-based VCO modeling for the signal and applies a stochastic averaging approach to obtain a closed-form expression for the noise floor. Additionally, the paper also introduces a numerical model suitable for simulating oscillator-based ESR experiments in a conventional circuit simulator environment. This model can be used to optimize sensor performance early on in the design phase. Finally, all presented models are verified against measured results from a prototype VCO operating at 14 GHz inside a 0.5 T magnetic field.

Sign in / Sign up

Export Citation Format

Share Document