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Physics Letters A

Laser-polarization-dependent and magnetically controlled optical bistability in diamond nitrogen-vacancy centers

Duo Zhang, Rong Yu, Jiahua Li, Chunling Ding, Xiaoxue Yang

Published Aug 7, 2013• 36 citations
Publisher
DOI
10.1016/j.physleta.2013.08.004

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We have investigated the optical bistability and optical multistability behaviors in a unidirectional ring cavity filled with diamond nitrogen-vacancy (defect centers driven by an elliptically polarized probe field in the presence of magnetic field and compare its properties with the corresponding closed system. Our numerical result demonstrates that threshold of optical bistability and the width of hysteresis loop can be manipulated by adjusting the phase difference between the two circularly polarized components of a single coherent field and cavity parameters, i.e., the electronic exit rate from cavity and electron injection rates. It is also shown that optical bistability and optical multistability are very sensitive to the relative phase between applied fields and magnetic field. It can be realized that by tuning the parameters the transition from bistability to multistability or vice versa can be obtained.
Nitrogen-vacancy centers in diamond have gained widespread attention as quantum systems that can be applied in quantum information devices. The excellent properties of quantum devices can be enhanced using preferentially oriented nitrogen-vacancy (NV) centers. However, thus far, orientation control has been achieved only via chemical vapor deposition. In this study, we demonstrate the creation of preferentially oriented NV centers via laser writing. The alignment ratio of ensemble NV centers is biased along the direction parallel to [111], depending on the femtosecond laser polarization, causing an increase of 55% in contrast to the optically magnetic resonance signal at maximum compared with 25% in random orientation. Based on time-dependent density-functional theory (TDDFT) simulations and experimental observations, such complex polarization dependence can be attributed to the anisotropy of electron excitation. This technique provides a new optical fabrication method for engineered materials and devices used in quantum technology.