Methods: Using existing literature (including grey literature), an online survey (consisted of 152 questions, 29 items related to young adults two of which were free text questions) was developed and sent to National Rheumatoid Arthritis Society (NRAS) members and distributed to non-members via social media tools including Facebook, Twitter and HealthUnlocked. Data collected included views and experiences in career planning and employment. The data pertaining to young adults are presented here.
Gc Agarwal Physics Book Free 236
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In this chapter, we give a brief review of our recent research works on photonic bandgapsinduced by standing-wave (SW) coupling fields in the regime of electromagnetically inducedtransparency (EIT). EIT refers to the absorption suppression or elimination of a weak probe goingthrough an atomic ensemble at the presence of a strong coupling, which is a result of laser induceddestructive quantum interference. On the other hand, a light signal cannot freely propagate in the mediawith periodic refractive indices (the so-called photonic crystals) if its carrier frequencies fall inside thephotonic bandgaps. Utilizing a SW coupling to attain the periodically modulated refractive index withlittle absorption, one can establish an induced photonic bandgap with its width and positiondynamically tunable. The potential media may be either cold atomic ensembles or solid materialsexhibiting defect states, such as Pr3+: Y2SiO5 and diamond containing N-V color centers. We firstconsider the steady optical responses of the atomic and solid media with dynamically induced bandgapsto a time- independent probe by focusing on the dispersion curves of Bloch wave vectors and thespectra of reflection and transmission. Then, we examine the propagation dynamics of a probe pulsethrough a cold atomic sample in two different situations where a dynamically induced bandgap existsor not. We find that the SW coupling field can be easily modulated to mold the traveling-light flow andto control the stationary-light generation with quite high flexibility, and thus may have applications inthe fields of classical and quantum information processing of optical signals. In performing theoreticalsimulations, we also demonstrated several different but almost equivalent mathematical methods, i.e.the two-mode approximation method, the transfer-matrix method, and the Maxwell-Liouville equationmethod, to deal with the problems of SW-EIT. Comparison of these methods is quite helpful tounderstand the underlying physics of the formation of dynamically induced photonic bandgaps.
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