Optical-Tweezer Force
Estimate optical-tweezer gradient force using a caller-supplied trapping efficiency.
Description
An optical-tweezer force estimate scales optical momentum by a supplied trapping efficiency and medium index.
An optical-tweezer force estimate scales optical momentum by a supplied trapping efficiency and medium index. Efficiency encodes the particle-and-beam interaction externally.1
Estimate optical-tweezer gradient force using a caller-supplied trapping efficiency.
When to use Optical-Tweezer Force
Use this tool to estimate optical-tweezer gradient force using a caller-supplied trapping efficiency.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use Optical-Tweezer Force and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter opticalPowerWatts, mediumRefractiveIndex, trappingEfficiency using the field table and calculation rules, then run the tool.
- Read gradientForceNewtons, gradientForcePiconewtons. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| opticalPowerWatts | Trapping-beam power (W) | number; minimum: 0 | Required |
| mediumRefractiveIndex | Medium refractive index | number; minimum: 0 | Required |
| trappingEfficiency | Dimensionless trapping efficiency | number; minimum: 0 | Required |
Enter nonnegative power, refractive index and trapping efficiency. Return force in newtons and pN using c=299792458 m/s.
force=nPQ/c Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| gradientForceNewtons | Estimated gradient force (N) | number; minimum: 0 |
| gradientForcePiconewtons | Estimated gradient force (pN) | number; minimum: 0 |
{
"input": {
"opticalPowerWatts": 299792458,
"mediumRefractiveIndex": 1,
"trappingEfficiency": 1
},
"output": {
"gradientForceNewtons": 1,
"gradientForcePiconewtons": 1000000000000
}
}Limitations and assumptions
Efficiency is not constrained to one or derived from geometry. No trapping stability, stiffness or Brownian motion is assessed.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Photon-Pressure Nudge: Estimate ideal photon-pressure force, impulse, and target velocity change. For a complementary task, use Focused-Beam Waist Location: Propagate a Gaussian beam q parameter through a thin lens to locate the new waist.
References
-
Optical-Tweezer Force — tool.io
Similar or alternative tools
- Photon-Pressure Nudge
Estimate ideal photon-pressure force, impulse, and target velocity change.
- Focused-Beam Waist Location
Propagate a Gaussian beam q parameter through a thin lens to locate the new waist.