Purcell factor
E266671
The Purcell factor quantifies the enhancement or suppression of a quantum emitter’s spontaneous emission rate caused by its electromagnetic environment, such as an optical cavity or resonator.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Purcell factor canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2421113 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Purcell factor Context triple: [Edward M. Purcell, notableConcept, Purcell factor]
-
A.
Huang–Rhys factor
The Huang–Rhys factor is a dimensionless parameter in solid-state and molecular spectroscopy that quantifies the strength of electron–phonon (vibronic) coupling during electronic transitions.
-
B.
Unruh effect
The Unruh effect is a predicted phenomenon in quantum field theory where an accelerating observer perceives what inertial observers consider vacuum as a warm bath of particles with a characteristic temperature.
-
C.
Landé g-factor
The Landé g-factor is a dimensionless quantity in atomic physics that characterizes the splitting of atomic energy levels in a magnetic field by relating the total angular momentum of an electron or atom to its magnetic moment.
-
D.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
-
E.
Kapitza–Dirac effect
The Kapitza–Dirac effect is a quantum phenomenon in which a beam of particles, such as electrons or atoms, is diffracted by a standing wave of light, demonstrating the wave-particle duality of matter.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Purcell factor Target entity description: The Purcell factor quantifies the enhancement or suppression of a quantum emitter’s spontaneous emission rate caused by its electromagnetic environment, such as an optical cavity or resonator.
-
A.
Huang–Rhys factor
The Huang–Rhys factor is a dimensionless parameter in solid-state and molecular spectroscopy that quantifies the strength of electron–phonon (vibronic) coupling during electronic transitions.
-
B.
Unruh effect
The Unruh effect is a predicted phenomenon in quantum field theory where an accelerating observer perceives what inertial observers consider vacuum as a warm bath of particles with a characteristic temperature.
-
C.
Landé g-factor
The Landé g-factor is a dimensionless quantity in atomic physics that characterizes the splitting of atomic energy levels in a magnetic field by relating the total angular momentum of an electron or atom to its magnetic moment.
-
D.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
-
E.
Kapitza–Dirac effect
The Kapitza–Dirac effect is a quantum phenomenon in which a beam of particles, such as electrons or atoms, is diffracted by a standing wave of light, demonstrating the wave-particle duality of matter.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
dimensionless quantity
ⓘ
figure of merit ⓘ physical quantity ⓘ |
| appliesTo |
atoms in optical cavities
ⓘ
color centers in solids ⓘ molecules in resonators ⓘ quantum dots ⓘ single-photon emitters ⓘ |
| definedAs | ratio of modified spontaneous emission rate to free-space spontaneous emission rate ⓘ |
| dependsOn |
cavity mode volume V
ⓘ
cavity quality factor Q ⓘ dipole orientation relative to cavity field polarization ⓘ emission wavelength ⓘ refractive index of the medium ⓘ spatial overlap between emitter and cavity field ⓘ spectral detuning between emitter and cavity mode ⓘ |
| describes |
enhancement of spontaneous emission
ⓘ
modification of spontaneous emission rate ⓘ suppression of spontaneous emission ⓘ |
| field |
cavity quantum electrodynamics
ⓘ
nanophotonics ⓘ photonics ⓘ quantum information science ⓘ quantum optics ⓘ |
| hasFormula | F_P = (3 / (4 π^2)) (λ / n)^3 (Q / V) for an optimally placed and oriented emitter on resonance ⓘ |
| namedAfter |
Edward M. Purcell
ⓘ
surface form:
Edward Mills Purcell
|
| relatedTo |
beta factor
ⓘ
nonradiative decay rate ⓘ radiative decay rate ⓘ strong and weak coupling regimes in cavity QED ⓘ |
| relatesTo |
cavity quality factor
ⓘ
electromagnetic environment ⓘ emitter–cavity coupling strength ⓘ local density of optical states ⓘ mode volume ⓘ optical cavity ⓘ optical resonator ⓘ spontaneous emission ⓘ |
| symbol |
F_P
ⓘ
Fp ⓘ |
| usedFor |
controlling emission directionality
ⓘ
designing high-efficiency quantum emitters ⓘ engineering radiative lifetimes ⓘ enhancing light–matter interaction ⓘ increasing single-photon source brightness ⓘ |
| usedIn |
cavity QED experiments
ⓘ
microdisk and microring resonator design ⓘ nanocavity design ⓘ photonic crystal cavity design ⓘ plasmonic nanoantenna design ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Purcell factor Description of subject: The Purcell factor quantifies the enhancement or suppression of a quantum emitter’s spontaneous emission rate caused by its electromagnetic environment, such as an optical cavity or resonator.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.