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The photon is modeled as a monochromatic solution of Maxwell's equationsconfined as a soliton wave by the principle of causality of special relativity.The soliton travels rectilinearly at the speed of light. The solution canrepresent any of the known polarization (spin) states of the photon. Forcircularly polarized states the soliton's envelope is a circular ellipsoidwhose length is the observed wavelength ($\lambda$), and whose diameter is$\lambda/\pi$; this envelope contains the electromagnetic energy of the wave($h\nu=hc/\lambda$). The predicted size and shape is confirmed by experimentalmeasurements: of the sub-picosecond time delay of the photo-electric effect, ofthe attenuation of undiffracted transmission through slits narrower than thesoliton's diameter of $\lambda/\pi$, and by the threshold intensity requiredfor the onset of multiphoton absorption in focussed laser beams. Inside theenvelope the wave's amplitude increases linearly with the radial distance fromthe axis of propagation, being zero on the axis. Outside the envelope the waveis evanescent with an amplitude that decreases inversely with the radialdistance from the axis. The evanescent wave is responsible for the observeddouble-slit interference phenomenon.Comment: 8 pages: for AIP Proceedings of QTRF-3, Quantum Theory:  Reconsideration of Foundations, Vaxjo, Sweden, June 6-11, 200

Einstein’s Photon Concept Quantified by the Bohr Model of the Photon