For over a century, physics has taught that light is “both wave and particle,” with the photon elevated to a fundamental constituent of nature. This article revisits how thecorpuscular picture of light became dominant—from Newton and Huygens to Einstein’s photoelectric effect and Compton’s scattering—and argues that much of the alleged evidence for photons as “particles” can be reinterpreted more economically in a purely wave-based framework. We highlight a conceptual tension of twentieth-century quantum rhetoric: electrons and photons are routinely described as if they “knew” our experimental intentions, while any serious discussion of consciousness beyond humans is dismissed as unscientific. Building on a recently proposed geometric reinterpretation of the Compton effect—where the wavelength shift arises from field–structure coupling rather than particle–particle collisions—we show how the photoelectric effect and double-slit experiments can likewise be understood without attributing ontological particle status to light. Discreteness emerges not from light being made of corpuscles, but from quantized field modes and the event-like nature of charge in matter. The electromagnetic field remains a wave throughout; only matter clicks. This work integrates new conceptual insights, including two revealing paradoxes of the standard narrative and three implicit principles that guide our geometric reinterpretation, while preserving the full depth and detail of the original analysis.
For over a century, physics has taught that light is “both wave and particle,” with the photon elevated to a fundamental constituent of nature. This article revisits how thecorpuscular picture of light became dominant—from Newton and Huygens to Einstein’s photoelectric effect and Compton’s scattering—and argues that much of the alleged evidence for photons as “particles” can be reinterpreted more economically in a purely wave-based framework. We highlight a conceptual tension of twentieth-century quantum rhetoric: electrons and photons are routinely described as if they “knew” our experimental intentions, while any serious discussion of consciousness beyond humans is dismissed as unscientific. Building on a recently proposed geometric reinterpretation of the Compton effect—where the wavelength shift arises from field–structure coupling rather than particle–particle collisions—we show how the photoelectric effect and double-slit experiments can likewise be understood without attributing ontological particle status to light. Discreteness emerges not from light being made of corpuscles, but from quantized field modes and the event-like nature of charge in matter. The electromagnetic field remains a wave throughout; only matter clicks. This work integrates new conceptual insights, including two revealing paradoxes of the standard narrative and three implicit principles that guide our geometric reinterpretation, while preserving the full depth and detail of the original analysis.
AbstractWave–particle duality is often presented as an intrinsic property of light, a fundamental enigma of quantum mechanics that requires accepting light as both wave and particle depending on the experiment. This paper challenges that narrative by demonstrating that duality is not a law of nature but a didactic artifact — one that obscures a far simpler and more consistent physical reality. Light behaves as a classical electromagnetic wave, while the discreteness observed in interactions arises exclusively from the quantised nature of matter, not the field itself. The semiclassical model, in which a classical electromagnetic field interacts with quantised detectors, fully explains all optoelectronic phenomena relevant to electrical engineering, from the photoelectric effect to the behavior of CMOS sensors, without ever invoking the concept of light as a particle. Historical and experimental evidence supports this view: Fowler’s 1931 measurements revealed that the photoelectric threshold smears at temperatures above absolute zero due to the Fermi–Dirac statistics of electrons in metals, not because of any quantisation of light. Hübel’s 1987 school experiments confirmed these findings in an accessible educational setting, while Herrmann’s 1994 framework demonstrated that the external photoelectric effect can be described as a three-step process — penetration depth of radiation, escape depth of electrons, and the work function — none of which require the existence of photons. A simple and inexpensive experiment, costing around 150 euros and fitting on a kitchen table, illustrates this clearly: a laser pointer, a precision double slit, and a lensless digital camera separate the three phases of the process — emission as a quantised matter process, propagation as a classical Maxwell wave, and detection through the band structure of the silicon sensor. The only limitation of this model, second-order intensity correlations, lies far beyond the scope of typical electrical engineering applications. In conclusion, for electrical engineers, the photon is best understood as a finite electromagnetic wave train. The discreteness of interaction with matter does not originate from the wave train but from the matter itself. This paper argues for replacing the duality narrative with a semiclassical model that is physically precise, didactically clearer, and professionally essential for understanding modern optoelectronics.
Quantum field theory describes the particle nature of electromagnetic radiation using the "photon," but has never explained why a fundamental particle exhibits such perfect wave behavior. This paper provides a complete alternative explanation: the photoelectric effect, Compton scattering, and antibunching experiments — landmark experiments considered proof of photon particle nature — require no photon concept. Quantization is not a property of light itself, but of the discrete energy level structure governing how bound electrons emit and absorb energy. Light remains a continuous transverse wave; discreteness results from electrons as "prisoners" in atomic "cages" that can only transition between specific energy steps. Waves propagate continuously and are emitted and absorbed in quantized form — the photon is not a particle, but the name of an energy-exchange event.
There are two opposing points of view on the nature of light: the first one manifests the wave-particle duality as a fundamental property of the nature; the second one claims that photons do not exist and the light is a continuous classical wave, while the so-called “quantum” properties of this field appear only as a result of its interaction with matter. In this paper we show that many quantum phenomena which are traditionally described by quantum electrodynamics can be described if light is considered within the limits of classical electrodynamics without quantization of radiation. These phenomena include the double-slit experiment, the photoelectric effect, the Compton effect, the Hanbury Brown and Twiss effect, the so-called multiphoton ionisation of atoms, etc. We show that this point of view allows also explaining the “wave-particle duality” of light in Wiener experiments with standing waves. We show that the Born rule for light can easily be derived from Fermi’s golden rule as an approximation for low-intense light or for short exposure time. We show that the Heisenberg uncertainty principle for “photons” has a simple classical sense and cannot be considered as a fundamental limitation of accuracy of simultaneous measurements of position and momentum or time and energy. We conclude that the concept of a “photon” is superfluous in explanation of light-matter interactions.
The Compton effect is conventionally represented as a collision between a photon and an electron, with the observed wavelength shift determined by energy--momentum conservation and scattering geometry. This article revisits the event from a complementary perspective. Beginning from the experimental relation itself and from the wave side of wave--particle duality, we explore the Compton encounter as a finite dynamical process involving geometry, response, coupling, reorganization, and characteristic times. Two heuristic encounters guide the analysis. A stone striking a responsive surface foregrounds deformation, resistance, and relaxation, while a gravitational assist foregrounds trajectory and path-dependent exchange. These perspectives are then returned to a vortical reading of the electron and electromagnetic radiation. We distinguish an interaction time τint from a relaxation time τrelax, introduce the provisional ratio Rτ=τint/τrelax, and organize geometry, energetic cost, and coupling into a dynamical grammar of the encounter. The comparison is then extended to the photoelectric effect. Placing the naked experimental features of both phenomena side by side reveals a common radiation--matter interaction structure together with different accessible outcomes. This motivates the speculative possibility that Compton scattering and photoelectric emission occupy neighbouring regimes within a broader landscape of radiation--matter encounters. A provisional quantity, Ravail, is introduced as a possible measure of the capacity of an electronic structure and its local environment to accommodate and redistribute an incoming perturbation within a given regime. The article therefore proposes an enlargement of the Compton problem: from reproducing the observed scattering relation to investigating the physical dynamics that may connect distinct radiation--matter outcomes.
The photoelectric effect, the Compton effects, and now anticorrelation experiments have been claimed to prove that light consists of particles flying through a void. However the particle model is decisively falsified by the known wave qualities of electromagnetic radiation. Quantum Electrodynamics also uses spreading wave amplitudes; not flying particles. The evidence indicates that light is a wave and electrons are electromagnetic wave-structures that absorb and emit light in discrete wave-packets. These wave-quanta are emitted directionally and then spread in space in proportion to their wavelength. Their waves superposition with all other waves in space. In low intensity experiments, the waves that an electron in a photodetector absorbs come from the superpositioning of the source wave-quanta and background radiation. The importance of background radiation is evidenced by "dark counts". Treating electrons and the quanta they absorb and emit as particles when they are composed of waves is the source of all the paradoxes, unreality and confusion in Quantum Mechanics. The word "photon" should be replaced by "quantum" in the description of this particular electronic process. The conceptual model presented here explains the known phenomena without producing paradoxes and unifies quantum and classical electromagnetics.
The long history of the dispute among physicists as to whether matter is composed of particles or waves is reviewed. A turning point came at the dawn of the 20th century in the form of the de Broglie momentum-wavelength and Bohr/Planck energy frequency relations. It was on this basis that Schrödinger developed a quantum mechanical differential equation whose solution came to be known as a wave function. The Born Interpretation of these functions holds that their absolute square constitutes a probability distribution which has been used successfully to make predictions of the properties of the system under discussion. It is pointed out that the phenomenon of light refraction played a key role in the development of both Newton’s corpuscular theory of light and the competing theory of Huygens which looks upon light as consisting exclusively of waves. It is shown that Newton’s failure to predict the decrease in the speed of light as it passes from air into water was not because of his belief in the particle composition of light, but rather because he not did anticipate that the mass of a photon changes upon entering a medium of higher index of refraction n. By assuming that the energy E of light is equal pc/n, where p is the momentum of the photons and c is the speed of light in free space, it is shown that the experimental dependence of the speed the light on its wavelength as it passes through a transparent medium is derived successfully through the use of Hamilton’s Canonical Equations and Newton’s Second Law of Kinetics. It is suggested that the relationship between particles and waves can be understood by noting that the localized properties of matter exhibit themselves in experiments such as the photoelectric effect where attention can be concentrated on the behavior of a single particle. The corresponding wave properties occur when large numbers of particles are observed under exactly similar circumstances, as for example in electron diffraction. ...........