On Saturday, September 25, 2021 at 1:46:01 PM UTC+2 [email protected] wrote:
> On Fri, Sep 24, 2021 at 10:21 AM Lawrence Crowell < > [email protected]> wrote: > > *> I am curious by what is meant by a single photon being nonlinear. I >> could not find this on arxiv.* >> > > If this explanation is incorrect, blame me and not the authors of the > article. But if I'm reading them correctly they use that term because they > used a pump laser to produce a population inversion in the laser > microcavity with the higher vibrational energy being exactly one quantum > level above the other. They could control it so precisely that when they > increased the excitation density of the micro resonating chamber by just > one photon the entire laser transitioned from the linear to the nonlinear > regime. They found that due to the material used there was a wide spread in > the momentum distribution of the exciton, so the n-plane momentum > component of the trigger photon was not important, only the energy level of > the photon was. > The goal are things like all optical computers/devices. Capabilities such as switching, amplification, cascading, all optical logic require a substrate to mediate the interaction. Light doesn't interact with light in a pure vacuum obviously. Not in a way that is quickly switchable. Non-linear properties of hybrid light-matter condensates operating with lasers are called for. That Pump laser produces a large population of hot excitons which is relaxed back to polariton ground state. Sub-picosecond all-optical switching is reached by the combination of ultrafast exciton relaxation dynamics of organic semiconductors, and the sub-picosecond cavity lifetime of their setups. It's not the photon or laser that is nonlinear. The photon induces switching of the hybrid light-matter states of the exciton polariton condensates sandwiched between mirrors in the cavity. That high speed operability harnesses non-linearity of the condensate with lasers. Tiny photon seems to exploit even polariton-polariton interaction. One photon to flip a switch is extremely efficient. If this is what it seems, then battery draining of more powerful devices operating on way less power may happen. More power, speed, and environmentally friendly to boot? Our phones and computers are perhaps wasteful trash. James W. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/9cb98c84-1f5c-455c-95fc-99b37c6d1d5an%40googlegroups.com.
