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Materials (Basel). 2018 May 21;11(5). pii: E854. doi: 10.3390/ma11050854.

The Influence of the External Signal Modulation Waveform and Frequency on the Performance of a Photonic Forced Oscillator.

Author information

1
Faculty of Physics and Mathematics, BUAP, Avenida San Claudio y 18 Sur, Colonia San Manuel, Edificio FM1, Ciudad Universitaria, Puebla 72570, Mexico. sc.noemi@gmail.com.
2
Faubert Lab, School of Optometry, University of Montreal, Montreal, QC H3C3J7, Canada. sc.noemi@gmail.com.
3
Faculty of Physics and Mathematics, BUAP, Avenida San Claudio y 18 Sur, Colonia San Manuel, Edificio FM1, Ciudad Universitaria, Puebla 72570, Mexico. marthap@fcfm.buap.mx.
4
Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Avenida Universidad No. 1001 Col. Chamilpa, Cuernavaca, Morelos 62209, Mexico. de.e.wiese@gmail.com.
5
Instituto de Energías Renovables, Universidad Nacional Autonóma de México, Privada Xochicalco S/N, Temixco, Morelos 62580, Mexico. nxvaa@ier.unam.mx.
6
Instituto de Energías Renovables, Universidad Nacional Autonóma de México, Privada Xochicalco S/N, Temixco, Morelos 62580, Mexico. arp@ier.unam.mx.
7
CONACyT Fellow-CCADET Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico. betarina@gmail.com.
8
Faubert Lab, School of Optometry, University of Montreal, Montreal, QC H3C3J7, Canada. rafael.doti@gmail.com.
9
Faubert Lab, School of Optometry, University of Montreal, Montreal, QC H3C3J7, Canada. jocelyn.faubert@gmail.com.
10
Faubert Lab, School of Optometry, University of Montreal, Montreal, QC H3C3J7, Canada. eduardo.lugo@gmail.com.

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.

KEYWORDS:

electromagnetic forces; photodyne; photonic crystal; photonic oscillator

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