Tailoring a nanofiber for enhanced photon emission and coupling efficiency from single quantum emitters.
We present a novel approach to enhance the spontaneous emission rate of single quantum emitters in an optical nanofiber-based cavity by introducing a narrow air-filled groove into the cavity. Our results show that the Purcell factor for single quantum emitters inside the groove of the nanofiber-based cavity can be at least six times greater than for such an emitter on the fiber surface when using an optimized cavity mode and groove width. Moreover, the coupling efficiency of single quantum emitters into the guided mode of this nanofiber-based cavity can reach up to ∼80% with only 35 cavity-grating periods. This new system has the potential to act as an all-fiber platform to realize efficient coupling of photons from single emitters into an optical fiber for quantum information applications.
Fabrication of a nanofiber Bragg cavity with high quality factor using a focused helium ion beam
: Nanoﬁber Bragg cavities (NFBCs) are solid-state microcavities fabricated in an optical tapered ﬁber. NFBCs are promising candidates as a platform for photonic quantum information devices due to their small mode volume, ultra-high coupling eﬃciencies, and ultra-wide tunability. However, the quality ( Q ) factor has been limited to be approximately 250, which may be due to limitations in the fabrication process. Here we report high Q NFBCs fabricated using a focused helium ion beam. When an NFBC with grooves of 640 periods is fabricated, the Q factor is over 4170, which is more than 16 times larger than that previously fabricated using a focused gallium ion beam.
Self-responsibility in health care/promotion: motivational factors.
This paper explores motivational factors at play in self-responsibility in health care and promotion. If people do not take responsibility for their health status, is it because they can not or will not? "Can" refers to the ability or skill to do something, while "will" refers to intention and effort. Each of these factors are analyzed in terms of their role as a cause of behavior in self-responsibility for the health status. Educational intervention to motivate self-responsibility is suggested as well as empirical research in how people attribute health outcomes.