Such materials exist in two distinct states ("on" and "off"), depending on the wavelength of illumination.
As shown in Figure 2, the MOCa and MONa membranes can be switched on and off depending on the wavelength of the light used for illumination.
Therefore, a sensor built in this way can be completely switched on or off depending on the wavelength of the light used for illumination, or an ion extraction/release can be initiated using light.
A 450-W high-pressure mercury arc lamp was used as the light source, where the light wavelength was controlled by selecting various filters, i.e., Pyrex glass for cutting off the light of wavelength <290 nm, Kenko L41 Super Pro (W) filter <400 nm, and Fuji triacetyl cellulose filter <510 nm [15].
In addition, a power law governs the relation between pull-off force and the wavelength ratio.
The peak response wavelength is located at 340 nm and cut-off is at the wavelength of 355 nm.
'Negative switching' RSFPs switch from the on- into the off-state at the wavelength, here ~480 nm, that is used to elicit fluorescence.
We also show how we implement this needed rice leaf color analyzer by integrating an off-the-shelf 562-nm wavelength light emitting diode (LED), a silicon photodiode, an 8-bit microcontroller, and a 6×1 LED panel in a compact plastic package.
The intensity observed in the off resonance scan obtained using this method arises from the residual absorption of the lipid at the off resonance wavelength, evident in Fig. 2b.
However, with SHG imaging, there is substantially less absorption of energy by the tissue compared to single-photon excitation if the fundamental wavelength is off the resonance wavelength of cellular constituents, and hence, there is negligible thermal or phototoxic damage [ 15].
