Mode Volume Calculator
Enter cavity wavelength and dimensions. The Mode Volume Calculator computes effective mode volume V_eff for common cavity types (Fabry-Pérot, photonic crystal, microdisk).
About the Mode Volume Calculator
The Mode Volume Calculator is a precise, scientifically accurate tool that computes the effective mode volume V_eff — the key figure of merit in cavity quantum electrodynamics (cQED) and nanophotonics. This Mode Volume Calculator implements the standard definitions and approximations used in research papers for common cavity types. Proudly supported by Agri Care Hub.
Scientific Definition
For approximate geometries:
• Fabry-Pérot: V_eff ≈ π w₀² L / 2
• Photonic crystal defect: V_eff ≈ (λ/n)³
• Microdisk: V_eff ≈ 2π R (λ/n)² (thickness factor)
Why This Calculator Is Essential
Mode volume determines: • Purcell factor (spontaneous emission enhancement) • Strong coupling regime in cQED • Single-photon source efficiency • Light-matter interaction strength • Quantum nonlinearity threshold Smaller V_eff enables stronger quantum effects and is the holy grail of nanophotonics.
How to Use
- Select cavity type (Fabry-Pérot, photonic crystal, microdisk).
- Enter wavelength λ and geometry dimensions.
- Click “Calculate Mode Volume”.
- Get V_eff in (λ/n)³ units — the standard benchmark.
When Should You Use This Tool?
- Cavity QED and strong coupling research
- Photonic crystal cavity design
- Microcavity and nanophotonics
- Single-photon source optimization
- Quantum optics experiments
- Teaching cavity enhancement effects
Scientific Foundation
The effective mode volume V_eff is defined as the ratio of total field energy to peak energy density. Values below (λ/n)³ indicate sub-wavelength confinement and are required for strong light-matter coupling. Full theory at Mode Volume on Wikipedia and Vahala’s *Optical Microcavities* (2004).
Conclusion
The Mode Volume Calculator brings professional nanophotonics analysis to your browser — with perfect accuracy and beautiful design. Whether you’re a student learning cavity QED, a researcher pushing the limits of light confinement, or an engineer designing quantum photonic devices, this tool delivers precise results every time. For more quantum optics tools, visit Agri Care Hub.