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Radiation Pressure: Problem Solving

Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...

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Related Experiment Video

Updated: Apr 22, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass ADG Fresnel Lens for Concentrating Photovoltaics

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Quantifying self-absorption losses in luminescent solar concentrators.

Otmar M Ten Kate, Koen M Hooning, Erik van der Kolk

|October 17, 2014

Summary

New analytical equations quantify self-absorption losses in luminescent solar concentrators (LSCs). This model accurately predicts efficiency decreases due to reabsorption, crucial for optimizing LSC performance.

Area of Science:

Optics and Photonics
Materials Science

Background:

Self-absorption is a key loss mechanism in luminescent solar concentrators (LSCs).
Accurate quantification of these losses is essential for improving LSC efficiency and device design.

Purpose of the Study:

To develop and present analytical equations for quantifying self-absorption losses in circular LSCs.
To provide a model that accurately predicts LSC efficiency reduction based on material and geometric properties.

Main Methods:

Derivation of analytical equations for self-absorption losses.
Numerical solution of these equations using commercial math software.
Input parameters include quantum efficiency, absorption/emission spectra, LSC dimensions, and refractive index.

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Main Results:

The model accurately predicts efficiency decrease as a function of LSC radius, thickness, and quantum efficiency.
Quantified reabsorption events, spectral red-shift, and distribution of reabsorption.
For a 50 cm radius LSC with Lumogen F Red 305 (80% quantum efficiency), self-absorption reduced edge-reaching photons by a factor of four.

Conclusions:

The developed equations offer a valuable tool for understanding and mitigating self-absorption in LSCs.
The model is applicable to various luminescent materials, including quantum dots.
Insights gained can guide the optimization of LSC design for enhanced performance.