The phrase "particular wavelength" refers to a specific type or frequency of light or energy. It is often used to describe something that is unique or specific to a certain situation or context. Full definition
A spectrophotometer allows for the measurements of concentration of multiple ions, compounds and large molecules based on the selective absorption of particular wavelengths of light. (teachermagazine.com.au)
Since different elements and compounds absorb light at characteristic wavelengths, astronomers can determine what chemicals make up a planet's atmosphere by measuring the relative amounts of light that come in at particular wavelengths. (discovermagazine.com)
In their proof - of - principle experiment, the researchers used germanium antimony telluride (GST)-- the kind of phase - change material found in CDs and DVDs — to make an improved switchable metasurface that can block or transmit particular wavelengths of light at the command of light pulses. (sciencedaily.com)