AI Article Synopsis
- Photonic crystals can inhibit certain wavelengths of light while allowing others to pass through, making them useful for various applications.
- A photonic structure called "photodyne" was created using two porous silicon one-dimensional photonic crystals with an air defect, which generates electromagnetic forces and mechanical oscillations when illuminated properly.
- The experiment tested different modulation waveforms and frequencies, finding that a sinusoidal waveform worked best at 5 Hz and 10 Hz for maximizing displacement and velocity, while a rectangular waveform was optimal at 15 Hz.
Article Abstract
Photonic crystals have been an object of interest because of their properties to inhibit certain wavelengths and allow the transmission of others. Using these properties, we designed a photonic structure known as photodyne formed by two porous silicon one-dimensional photonic crystals with an air defect between them. When the photodyne is illuminated with appropriate light, it allows us to generate electromagnetic forces within the structure that can be maximized if the light becomes localized inside the defect region. These electromagnetic forces allow the microcavity to oscillate mechanically. In the experiment, a chopper was driven by a signal generator to modulate the laser light that was used. The driven frequency and the signal modulation waveform (rectangular, sinusoidal or triangular) were changed with the idea to find optimal conditions for the structure to oscillate. The microcavity displacement amplitude, velocity amplitude and Fourier spectrum of the latter and its frequency were measured by means of a vibrometer. The mechanical oscillations are modeled and compared with the experimental results and show good agreement. For external frequency values of 5 Hz and 10 Hz, the best option was a sinusoidal waveform, which gave higher photodyne displacements and velocity amplitudes. Nonetheless, for an external frequency of 15 Hz, the best option was the rectangular waveform.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978231 | PMC |
| http://dx.doi.org/10.3390/ma11050854 | DOI Listing |
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