Hi Bob, I've been very busy for the last year and have not had the time to partake in the lively discussions in the Collective, and with the added publicity that vortex-l has had (thanks to Mark Gibbs and others) the quality of the discussions has definitely increased significantly. we've also lost some dear souls since LENR started heating up, and they are missed. L
Thanks for chiming in. Yes, I would agree that the size of the coherent system is an important key, and that that size would also dictate what kind of photons get absorbed vs which make it outside the bulk matter and into grad-student bulk matter! When you say, ". is not the answer to the cold fusion question.", are you saying that a LENR system doesn't involve coherency across many, many atoms length??? I did not get the impression that the referenced article was restricting it's hypothesis to two-body systems. -Mark From: Bob Cook [mailto:[email protected]] Sent: Thursday, October 16, 2014 7:18 AM To: [email protected] Subject: Re: [Vo]:coherent perfect absorption Mark-- The size of the coherent system is the key. Many bodies share the distribution of energy and total coherent system energy changes. Two body systems like that heretofore considered in hot fusion physics (and extended to all solid state physics by many) are not the answer to the cold fusion question in most cases IMHOI. Bob Cook ----- Original Message ----- From: MarkI-ZeroPoint <mailto:[email protected]> To: [email protected] Sent: Wednesday, October 15, 2014 11:35 PM Subject: [Vo]:coherent perfect absorption Just some food for Collective thought. as to why no dead grad students. "Perfect energy-feeding into strongly coupled systems and interferometric control of polariton absorption" http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3106.html Abstract The ability to drive a system with an external input is a fundamental aspect of light-matter interaction. The key concept in many photonic applications is the 'critical coupling' condition1, 2: at criticality, all the energy fed to the system is dissipated within the system itself. Although this idea was crucial to enhance the efficiency of many devices, it was never considered in the context of systems operating in a non-perturbative regime. In this so-called strong-coupling regime, the matter and light degrees of freedom are mixed into dressed states, leading to new eigenstates called polaritons3, 4, 5, 6, 7, 8, 9, 10. Here we demonstrate that the strong-coupling regime and the critical coupling condition can coexist; [emphasis mine] >>>> in such a strong critical coupling situation, all the incoming energy is converted into polaritons. <<<< A general semiclassical theory reveals that such a situation corresponds to a special curve in the phase diagram of the coupled light-matter oscillators. In the case of a system with two radiating ports, the phenomenology shown is that of coherent perfect absorption (CPA; refs 11, 12), which is then naturally understood in the framework of critical coupling. Most importantly, we experimentally verify polaritonic CPA in a semiconductor-based intersubband-polariton photonic crystal resonator. This result opens new avenues in polariton physics, making it possible to control the pumping efficiency of a system independent of the energy exchange rate between the electromagnetic field and the material transition. -mark iverson
