Development of pulsed ESR for quantum information processing

Saha, Sagnik (2019) Development of pulsed ESR for quantum information processing. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Sagnik Saha (14MS054)) 14MS054.pdf - Submitted Version Restricted to Repository staff only Download (2MB)

Abstract

My work is to develop two types of planar resonators for pulsed ESR spectrometer. Two half wavelength resonators based on microstrip technology with characteristic impedance of 50 and different geometrical shapes are fabricated on commercially available copper clad microwave laminates. We have performed simulations for the two microstrip resonators in CST Microwave Studio software and have extracted practical design parameters which were used for fabrication. The effect of geometry of the resonators on the quasi-transverse electromagnetic modes of the resonators is noted from simulation results. The fabrication is done using optical lithography technique in which laser printed photomasks are used. The resonators are characterized using a Vector Network Analyzer. The fabricated res- onators are used to standardize a home built low-temperature continuous wave electron spin resonance (CW-ESR) spectrometer which operates in S-band, by capturing the ab- sorption spectrum of the free radical DPPH, at both room temperature and 77 K. The measured value of g-factor using our resonators is consistent with the values reported in literature. The designed half wavelength planar resonators will be eventually used in set- ting up a pulsed electron spin resonance spectrometer by suitably modifying the CW-ESR spectrometer.

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