Photons behave like fluids in superfluids; "liquid light".
Also, the paths of photons are affected by the media of transmission: gravity, gravitational waves, and water fluid waves bend light.
Photonic transmission and retransmission occurs at least in part by phononic excitation of solids and fluids; but in the vacuum of space if there is no mass, how do quanta propagate?
Optical rogue waves > Principles: https://en.wikipedia.org/wiki/Optical_rogue_waves :
> Supercontinuum generation with long pulses: Supercontinuum generation is a nonlinear process in which intense input light, usually pulsed, is broadened into a wideband spectrum. The broadening process can involve different pathways depending on the experimental conditions, yielding varying output properties. Especially large broadening factors can be realized by launching narrowband pump radiation (long pulses or continuous-wave radiation) into a nonlinear fiber at or near its zero-dispersion wavelength or in the anomalous dispersion regime. Such dispersive characteristics support modulation instability, which amplifies input noise and forms Stokes and anti-Stokes sidebands around the pump wavelength. This amplification process, manifested in the time domain as a growing modulation on the envelope of the input pulse, then leads to the generation of high-order solitons, which break apart into fundamental solitons and coupled dispersive radiation
FWIU photonic superradiance is also due to critical condition(s).
Re: Huygens and photons; https://news.ycombinator.com/item?id=40492160 :
>> This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity [given Huygens' applied]
TODO: remember the name of the photonic effect of self-convolution and nonlinearity and how the wave function interferes with itself in the interval [0,1.0] whereas EM waves are [-1,1] or log10 [-inf, inf].
Coherence, Wave diffraction vs. wave interference > Superposition principle: https://en.wikipedia.org/wiki/Superposition_principle#Wave_d...