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Fundamental limits in photonics and electromagnetics: a tutorial

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Pith's one-line read A tutorial reviews fundamental physical bounds on light-matter interactions across scales in photonics and electromagnetics.

desk verdict This is a tutorial review that organizes existing bounds on light-matter interactions but introduces no new results or frameworks. read the letter →

arxiv 2605.24738 v1 pith:RQBQOHZX submitted 2026-05-23 physics.optics

Owen D. Miller , Francesco Monticone This is my paper · ORCID
classification physics.optics
keywords fundamentallimitsphotonicselectromagneticslight-matterinteractionsphysicalboundswavepropagationscatteringtutorial
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper reviews the fundamental principles constraining light-matter interactions and organizes limits by hierarchical scale, from optical material responses through wave propagation and scattering to functional phenomena. It aims to unify prior results on these bounds while identifying open questions that remain in the field. This synthesis is intended to let readers quickly engage with the current frontier and help build toward a universal framework for light interactions with matter.

What carries the argument

Hierarchical scales of limits, from optical material responses to wave propagation, scattering, and optical phenomena and functions.

What would settle it

Discovery of a major physical bound or constraint in photonics or electromagnetics that is omitted from the tutorial or presented with clear interpretive error.

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Extended reading notes

Core claim

The tutorial synthesizes existing physical bounds and constraints on light-matter interactions, structured hierarchically from material responses to wave propagation, scattering, and related optical functions, while highlighting unresolved questions to support progress on a universal framework.

Load-bearing premise

The tutorial's selection and synthesis of prior literature accurately and comprehensively represents the key limits without significant omissions or interpretive bias.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 3 minor

Summary. The manuscript is a tutorial review that first outlines fundamental principles constraining light-matter interactions in photonics and electromagnetics, then surveys physical bounds and limits across hierarchical scales (optical material responses, wave propagation, scattering, and related functions), and concludes by advocating a unified treatment while identifying open questions to accelerate reader entry into the research frontier.

Significance. If the synthesis accurately and comprehensively represents the cited literature without interpretive bias, the tutorial would provide a useful entry point for newcomers by consolidating disparate bounds into one narrative and flagging unresolved issues; the absence of new derivations or predictions means its value rests entirely on the quality of the literature selection and organization.

minor comments (3)
  1. The abstract states the goal of a 'more unified treatment,' but the manuscript should explicitly define what unification means (e.g., common mathematical framework, shared assumptions across scales) in an early section to avoid the impression of a simple juxtaposition of results.
  2. Several cited limits (e.g., those derived from causality or passivity) are referenced without a brief recap of their key assumptions or the precise statement of the bound; adding one-sentence reminders would improve accessibility for readers new to the sub-area.
  3. The discussion of open questions at the end would benefit from a short table or enumerated list that cross-references each question to the relevant earlier section, making the connection between reviewed results and frontiers more concrete.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary of the manuscript and for recommending minor revision. The report correctly identifies the tutorial's scope and intent to consolidate bounds across scales while highlighting open questions. No specific major comments were raised.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: tutorial synthesis of external literature

full rationale

The paper is explicitly a tutorial review whose purpose is to synthesize and unify existing results on physical bounds in photonics and electromagnetics drawn from prior literature. No original derivations, quantitative predictions, fitted parameters, or new technical claims are advanced that could reduce by construction to self-citations or inputs. The abstract and structure confirm the work reviews fundamental principles at multiple scales and highlights open questions without introducing load-bearing steps that equate to the paper's own content. As a result the derivation chain is absent and the content remains self-contained against external benchmarks.

Assumptions & free parameters 0 free parameters · 0 assumptions · 0 invented entities

As a tutorial review, the paper introduces no new free parameters, axioms, or invented entities; it relies on standard principles from prior physics literature.

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Cite this review

Pith. "Pith review of Fundamental limits in photonics and electromagnetics: a tutorial." pith.science (2026). https://pith.science/paper/RQBQOHZX

@misc{pith2026260524738,
  author       = {Pith},
  title        = {Pith review of: Fundamental limits in photonics and electromagnetics: a tutorial},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/RQBQOHZX}},
  note         = {Machine review of arXiv:2605.24738}
}
read the original abstract

Theoretical limits and physical bounds across many areas of science, mathematics, and technology -- including Shannon's information-capacity limits, Bennett and Landauer's thermodynamic limits on computation, and G\"odel's incompleteness theorem in formal logic -- serve as defining pillars of their fields. In photonics and electromagnetism, numerous physical bounds and constraints have likewise been uncovered over the past several decades. In this Tutorial, we first review the fundamental principles that constrain light-matter interactions, and then discuss limits at different hierarchical scales, from optical material responses to wave propagation, scattering, and related optical phenomena and functions, relevant to a wide range of applications. By providing a more unified treatment of these results and highlighting the many open questions that remain, our goal is to help readers rapidly get up to speed with the frontier of this research area and contribute to advancing the broader vision of a universal framework for fundamental limits of light interactions with matter.

Figures

Figures reproduced from arXiv: 2605.24738 by the authors.

Figure 1
Figure 1. Overview of the manuscript, illustrating the fundamental principles and broad classes of bounds discussed in this Tutorial. A brief sixth chapter looks forward [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Causality, absorption, and frequency dispersion. Thought experiment illus￾trating the fundamental connection between causality and dispersion. An input signal that is zero for t < 0 can be expressed as a superposition of harmonic components, each of which individually extends from t = −∞ to t = +∞. A system that absorbs only a single frequency component while leaving all others unaffected would necessarily be noncau… view at source ↗
Figure 3
Figure 3. Maximum refractive index. (a) Schematic of a single Drude–Lorentz oscillator illustrating the tradeoff between refractive index and dispersion. Lowering the resonance frequency ω0 increases the ratio ω 2 p/ω 2 0 , thereby enhancing the maximum refractive index nmax at frequency ω, but at the expense of increased dispersion dn/dω. The plasma frequency ωp = p Ne2/(ε0me) and, hence, the oscillator strength, are set by … view at source ↗
Figures from the paper (45 more)
Figure 4
Figure 4. Figure 4: Lossy and lossless metals. (a) Absorption in metals: Absorption of a photon with small momentum/wavevector assisted by a phonon or defect (dashed arrows), or direct ab￾sorption of a confined surface plasmon-polariton (SPP) with large momentum/wavevector (solid arrow), …
Figure 5
Figure 5. Figure 5: Bounds on resonant nonlinear susceptibilities. (a) Schematic of a three￾level system used for a second-order sum-frequency generation (SFG) process (left), together with the corresponding physical bound on the normalized oscillator strength of the doubly resonant secon…
Figure 6
Figure 6. Figure 6: Mechanisms and energy requirements for large refractive-index modulation. (a) Schematic of a typical anharmonic potential U(x) of depth U0. The refractive index depends on its local curvature, averaged over all electrons, ⟨d 2U(x)/dx2 ⟩N, and on the electron density N …
Figure 7
Figure 7. Figure 7: Plane-wave focusing. (a) Schematic of the 2π and 4π aperture limits. (b) Optimal focusing coefficients, as a function of wavenumbers kx and ky, for sinθ = 0.8. When normalizing by amplitude, the smaller kx values have the largest relative contribution to |Ex| 2 ; when …
Figure 8
Figure 8. Figure 8: Comparison of optimal focusing fields. Radial fields in the paraxial, 2π, and 4π apertures. One can see that maximally intense fields broaden a bit as their numerical aperture increases from paraxial to 2π, but then significantly tighten in going from 2π to 4π, with a …
Figure 9
Figure 9. Figure 9: Bounds on focal-point intensity subject to a spot-size constraint. (a) Optimal radial intensity profiles, in the paraxial limit, for normalized zero-field spot sizes ranging from G = 0.5λ down to 0.1λ. (b) Maximal Strehl ratio Smax as a function of G, exhibiting the un…
Figure 10
Figure 10. Figure 10: Space-time-optimal focusing (1D). Left: The full electric field E(x,t), with two counter-propagating wave packets along x = ±ct coherently summing to a sharp focus at the spacetime origin; the dotted line marks the t = 0 cross-section. Right: The spacetime-focused fie…
Figure 11
Figure 11. Figure 11: Partial time reversal at an outer boundary. Four-step construction underlying Eq. (113). (1) The interior sources s0 (purple, possibly within scatterers shown in grey) radiate fields ψ under outgoing boundary conditions (PML). (2) “Perfectly cancelling cur￾rents” spcc…
Figure 12
Figure 12. Figure 12: Wigner–Smith time-delay extremal modes. (a) Examples of wave functions that minimize time delay between ports/leads for a strongly scattering rectangular cavity. These modes (termed “NOTEs”) show quite different transmission statistics than those predicted by random m…
Figure 13
Figure 13. Figure 13: A powerful method for complete coupling of free-space waves to guided modes. (a) Maximally focusing the incident field (including reflections from the surface) to the position of a point scatterer can generate large dipole moment, which then radiates in part to propag…
Figure 14
Figure 14. Figure 14: Communication channels. (a) General setup: sources in a transmitting volume VT generate electromagnetic fields measured in a disjoint receiver volume VR. (b) Specific configuration of two parallel 16λ ×16λ source/receiver arrays separated by 50λ. (c) The first 12 comm…
Figure 15
Figure 15. Figure 15: Overlapping nonlocality and thickness bounds. (a) An optical system with input and output surfaces separated by distance d. A dividing surface S cuts through both, defining a transverse aperture. (b) For an imager with N output pixels split into left and right halves,…
Figure 16
Figure 16. Figure 16: Active use of thickness and efficiency bounds in metalens design. (a) A wide￾FOV metalens whose input aperture Din is intentionally smaller than its output aperture Dout, mirroring conventional ray-optical imagers. (b) An inverse-designed monochromatic metalens with D…
Figure 17
Figure 17. Figure 17: Reciprocity constraints on extinction. (a) For any reciprocal scatterer (e.g. ε = ε T and µ = µ T ), extinction between two oppositely directed plane waves must be exactly equal, even if the absorption and scattering constituents take quite different values from the t…
Figure 18
Figure 18. Figure 18: Time-reversal-symmetry field-ratio bounds. (a-c) For a scatterer satisfying time-reversal symmetry, the magnitude of the internal field must be unchanged upon reversing all port power flows, both for two-port systems (panel a) and multi-port systems (panels b,c). (Pan…
Figure 19
Figure 19. Figure 19: Numerical validation of the time-reversal-symmetry field-ratio bounds. (a,b) Two-port system: an asymmetric multimodal cavity with an antireflection layer brings the input reflection close to zero, producing nearly identical field intensities for excitation from oppos…
Figure 20
Figure 20. Figure 20: Kirchhoff’s Law under a change of basis. (a) Nonreciprocal absorber/emitter that perfectly absorbs xˆ-polarized waves and perfectly emits yˆ-polarized waves, demonstrat￾ing ideal violation of Kirchhoff’s Law. (b) The same scatterer absorbs and emits equally into circu…
Figure 21
Figure 21. Figure 21: Beam combining: Allowed vs. impossible. (a) Perfect incoherent beam combining in a passive linear system is impossible. Physically possible alternatives include: (b) coherent excitations, (c) imperfect beam combining, and (d) active media. Ports are power-carrying “ch…
Figure 22
Figure 22. Figure 22: Metalens concentrator bounds. (a) A metalens concentrator that focuses 11 incoming-wave angles (incoherently) to a diffraction-limited (DL) spot [224]. (b) Bounds to maximum DL focusing efficiency for N incoherent excitations; the design of (a) has at most 9% DL focus…
Figure 23
Figure 23. Figure 23: Brightness theorem constraints in resonant TCMT. Incoherent excitations of a two-port waveguide (exemplified by a variable relative phase θ), cannot lead to resonance-assisted unity transmission with fewer than two output ports (a,e) or fewer than two resonance (b,f).…
Figure 24
Figure 24. Figure 24: Saturating the optical-theorem bounds with plasmonic and superscattering designs. (a) Plasmonic core–shell superscatterer [236]: TM channels of total angular momentum ℓ = 1,2,3 are tuned to a common frequency ω = 0.2932ωp, so the total scattering cross-section (blue) …
Figure 25
Figure 25. Figure 25: Optical-theorem bounds across all size regimes. (a) Extinction cross-section bounds for an Ag scatterer enclosed in a spherical region of radius R, illuminated by a plane wave at λ = 360 nm. The general bound Eq. (158) (black) tracks the realized Ag-sphere cross-secti…
Figure 26
Figure 26. Figure 26: Tightened bounds via reactive-power constraint. With the addition of a reactive power constraint, one can tighten bounds (solid lines) for subwavelength dielectric scatterers, relative to optical-theorem-only constraints (dashed lines). (Figure adapted from Ref. [255]…
Figure 27
Figure 27. Figure 27: Spectral response and sum rules in three prototypical scatterers. (a) A graphene sheet, (b) a TiO2 film, and (c) a silver sphere. (d) The extinction cross-section for a z-directed plane wave, normalized to the area/volume Ω, displays wide-ranging spectral behavior, ye…
Figure 28
Figure 28. Figure 28: Confirmation of the plasma-frequency-based sum rule for a dielectric material. (a) Simulated extinction cross-sections for a variety of antenna shapes and (b) their extinction as a function of total number of electrons. (c) Spectral contributions to extinction for a s…
Figure 29
Figure 29. Figure 29: LDOS sum rules from contour integration. (a) Schematic for LDOS calcula￾tion above a 2D sheet or 3D half-space, computed by a contour around the singularity at the origin (bottom). (b) Confirmation of the sum rule for 2D and 3D materials. The sum rules of these simply…
Figure 30
Figure 30. Figure 30: Common matrices constituting input–output relations in linear electro￾magnetism. For the first three, (a)–(c), it is an open question whether a KK relation, a sum rule, and a simple passivity condition can be combined for meaningful bounds. (d) Volume T matrices, whic…
Figure 31
Figure 31. Figure 31: Computational bounds via local conservation laws. (a) The hierarchical mean-field T-operator viewpoint: a structured scatterer inside a designable cubic domain (light blue), partitioned into nested subdomains. Constraints on the scattering T operator are imposed on ea…
Figure 32
Figure 32. Figure 32: Applications of the computational-bound framework. (a) Bounds on the near-field radiative Purcell enhancement of a dipole emitter coupled to a spherical, freeform￾patternable dielectric domain, plotted against the domain radius R/λ for several values of the material l…
Figure 33
Figure 33. Figure 33: Multi-functional design via cross-correlation constraints. (Left) A multi￾functional device must produce distinct responses—different focal spots, scattering pat￾terns, transmission angles, etc.—across multiple incident fields, frequencies, or material configurations,…
Figure 34
Figure 34. Figure 34: Limits on the polarizability of small scatterers. Magnitude of the electric￾dipole polarizability for a representative small scatterer (a subwavelength sphere composed of a lossy Drude metal with ε/ε0 = ε∞ −ω 2 p/(ω 2 +iγmω) and ε∞ > 1), illustrating some of the limit…
Figure 35
Figure 35. Figure 35: Energy requirements for resonance in photonic and plasmonic structures. (a) In a conventional optical cavity with dimensions larger than approximately half a wavelength, the stored energy oscillates (indefinitely, in the lossless case) between electric￾field energy (l…
Figure 36
Figure 36. Figure 36: Quality factor of plasmonic resonances in subwavelength metallic nanos￾tructures, as a function of resonance frequency, for gold (dashed line) and silver (dotted line). In the quasi-static regime, once the resonance frequency and the plasmonic material are specified, …
Figure 37
Figure 37. Figure 37: Minimum mode volumes of 2D dielectric cavities. (a) For scalar waves (or vector waves with out-of-plane polarization), there can be no singular field response, and the minimum mode volume scales with λ 2 and cannot be further reduced by fine features of size d ≪ λ. (b…
Figure 38
Figure 38. Figure 38: Light confinement beyond the diffraction limit in all-dielectric structures. (a) Example of a structure supporting a strongly confined electric field distribution associ￾ated with a deeply subwavelength mode volume. The structure consists of a 3D biconical antenna emb…
Figure 39
Figure 39. Figure 39: Fundamental tradeoffs among scattering, absorption, and directivity. (a) Admissible values of the absorption-to-scattering ratio for a given absorption level, as dictated by passivity for spherically symmetric scatterers. The boundary of the blue shaded region represe…
Figure 40
Figure 40. Figure 40: Perfect invisibility? Scattering cross sections, as a function of frequency, that are allowed and disallowed for finite, causal, stable scattering systems in free space. Nontrivial perfect invisibility is only possible on a discrete set of frequencies. scattering ampl…
Figure 41
Figure 41. Figure 41: A global bound on cloaking. Normalized scattering cross section over a broad wavelength range for different cloaking techniques. The cloaks are designed to suppress the scattering of (a) a dielectric sphere and (b) a perfectly conducting sphere at the central waveleng…
Figure 42
Figure 42. Figure 42: Fundamental bandwidth bounds on spherical-wave, plane-wave, and guided-wave reflection. Interpretation of Eqs. (210) (spherical-wave absorption), (213) (Rozanov bound), and (215) (Bode–Fano limit) as fundamental tradeoffs between in-band reflection magnitude and bandw…
Figure 43
Figure 43. Figure 43: The impedance-matching problem. Circuit topology used in the derivation of the Bode-Fano limit on broadband impedance matching. in Eq. (209) for the spherical case, assuming |Γ(ω)| = 1 outside the finite bandwidth of interest, one obtains |lnΓ0|B π ≤ k0∑ i µs,idi , (2…
Figure 44
Figure 44. Figure 44: Physical bounds on cloaking. (a) Normalized scattering cross section of an impenetrable sphere of radius a = λ0 (black curve) and of two cloaking devices, compared with the approximate physical bound from Ref. [371] (dashed red line). Existing bounds on cloaking are e…
Figure 45
Figure 45. Figure 45: Sensing with scattering resonances. (a) Typical experimental reflectance spectra for a refractive index sensor with noise, before (black curve) and after (gray curve) a perturbation. (b) Dependence of the total normalized Q-factor (orange curve) and resonance amplitud…
Figure 46
Figure 46. Figure 46: Limits to the delay-bandwidth product. (a) Dispersion diagram of a guided mode with linear dispersion (red line, shown only within the bandwidth ∆ω) bounded by the light lines corresponding to the maximum and minimum available refractive indices (blue lines). This con…
Figure 47
Figure 47. Figure 47: Application of delay-bandwidth limits to meta-optics. (a) Delay-line model of a thin, dispersion-engineered achromatic metalens. (b) Comparison of published achro￾matic metalens designs against the derived (normalized) bandwidth limits, shown as a function of numerica…
Figure 48
Figure 48. Figure 48: Toward a universal framework for fundamental limits of light interactions with matter, organized as a three-tier hierarchy: bounds on complex applications, bounds on basic photonic and electromagnetic response, and bounds on the constitutive material parameters themse…

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Pith tools

Reviewed June 30, 2026 · model on record in the stance chip above.