Implementation of optically detected magnetic resonance spectroscopy in a commercial <i>W</i>-band cylindrical cavity

Janssen, G.; Bouwen, A.; Casteels, P.; Goovaerts, E.

doi:10.1063/1.1406917

Cited by 13 publications

(11 citation statements)

References 9 publications

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“…10, together with that measured with a modified version of the Bruker probe head. In the latter case, excitation of the sample with nanosecond pulses from a frequencydoubled Q-switched Nd:YAG laser was performed by use of an optical fiber running through the long rod of the sample holder until it reaches the top of the quartz tube or rod carrying the sample [45]. The signal-to-noise ratios for the two cases, which also depend on the efficiency of the illumination, were essentially the same.…”

Section: Epr Resultsmentioning

confidence: 99%

High-frequency EPR applications of open nonradiative resonators

Annino

Fittipaldi

Martinelli

et al. 2009

Journal of Magnetic Resonance

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Section: Epr Resultsmentioning

confidence: 99%

High-frequency EPR applications of open nonradiative resonators

Annino

Fittipaldi

Martinelli

et al. 2009

Journal of Magnetic Resonance

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“…Here, the full rotation of the sample with respect to the magnetic field is generally required in single crystal studies. In addition, the cavity should be to some extent open, in order to allow an efficient static magnetic field modulation as well as radiofrequency excitation (for electron-nuclear double resonance techniques [9]), or optical access (in case of optically-activated samples or optically-detected magnetic resonance spectroscopy [10]). In the limit of high-field (millimeter wave) EPR, these requirements impose strict constraints on the realization of the cavity.…”

Section: Introductionmentioning

confidence: 99%

Open nonradiative cavities as millimeter wave single-mode resonators

Annino

Cassettari

Martinelli

2005

Review of Scientific Instruments

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Open single-mode metallic cavities operating in nonradiative configurations are proposed and demonstrated. Starting from well-known dielectric resonators, possible nonradiative cavities have been established; their behavior on the fundamental TE 011 mode has been predicted on the basis of general considerations. As a result, very efficient confinement properties are expected for a wide variety of open structures having rotational invariance. Test cavities realized having in mind practical millimeter wave constraints have been characterized at microwave frequencies. The field distribution of some relevant configurations has been modeled by means of a finite-element numerical method. The obtained results confirm the expected high performances on widely open configurations. A possible excitation of the proposed resonators exploiting their nonradiative character is discussed, and the resulting overall ease of realization enlightened in view of millimeter wave employments. _______________ @

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“…18 However, it was also shown that a single mode cylindrical TE 011 cavity instead of a multimode Fabry-Pérot cavity had greatly improved sensitivity and time resolution and was suitable for pulsed PL-EPR/ENDOR measurements. 19 Fabry-Pérot resonators consist of a pair of spherical mirrors, facing each other and separated by a distance d. The mirrors cause a focusing of the microwave beam giving it an hourglass shape.…”

Section: W-band (∼94 Ghz) Multimode Fabry-pérot Resonator For Mcda-epmentioning

confidence: 98%

High-field optically detected EPR and ENDOR of semiconductor defects using W-band microwave Fabry-Pérot resonators

et al. 2005

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The designs of W-band (approximately 95 GHz) Fabry-Pérot microwave resonators for optically detected EPR and ENDOR using the magnetic circular dichroism of the optical absorption (MCDA) as well as for photo-luminescence-detected EPR are briefly described. We report on the first MCDA-detected high-field EPR/ENDOR investigation of the paramagnetic EL2+ defect in semi-insulating GaAs. The higher-order effects, which prevented the unambiguous analysis of previous MCDA-detected K-band EPR/ENDOR experiments could be suppressed in W-band. The analysis of the ENDOR spectra showed that an extremely precise alignment of the samples is necessary. The paramagnetic El2+ defect turned out to be an As antisite defect, which has four almost equivalent nearest 75As neighbours differing less than 1.5% in the superhyperfine interactions suggestive of an isolated As antisite, while the third 75As shell (fifth neighbour shell) is clearly of lower symmetry than expected for an isolated As antisite. We discuss as a possible solution to this paradoxical situation that EL2+ is an isolated antisite at room temperature, which at low temperature, where all magnetic resonance experiments are performed, associates itself with shallow acceptors such as Zn(Ga)- more than two nearest neighbour distances away. According to recent theoretical calculations, such 'loose' complexes with binding energies between 0.01 eV and 0.05 eV and disturb the equivalence of the nearest neighbour superhyperfine (shf) interactions less than 1.5%. Also, W-band EPR was measured using the photo-luminescence for detection to investigate P dopants in 6H-SiC.

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Implementation of optically detected magnetic resonance spectroscopy in a commercial W-band cylindrical cavity

Cited by 13 publications

References 9 publications

High-frequency EPR applications of open nonradiative resonators

High-frequency EPR applications of open nonradiative resonators

Open nonradiative cavities as millimeter wave single-mode resonators

High-field optically detected EPR and ENDOR of semiconductor defects using W-band microwave Fabry-Pérot resonators

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