Abstract: Method for maximising the phase shift between two propagation modes (?1, ?2) of a light wave, of wavelength (?), which is propagated through a photonic crystal structure (1) in the spatial direction in which the crystal exhibits periodicity, comprising the following steps (a) obtaining the band diagram of the photonic crystal with periodic structure for the wave vectors (k) whose values are in the first Brillouin zone; (b) selecting the propagation mode (?2) of the wave (?) in the periodic structure of the photonic crystal, wherein said mode has a slope P2 of wavelength (?) with respect to the wave vector, of absolute value |P2|, working in slow wave regime; (c) selecting a propagation mode (?2) of said wave (?), wherein said mode has a slope P1 of wavelength (?) with respect to the wave vector, of absolute value |P1|, wherein |P1| is at least twice as large as |P2|; and (d) causing said phase shift between the propagation modes (?1, ?2) selected in steps (b) and (c) by propagating said wave (?) through sa

Abstract: This invention describes a photonic sensing method and device based on the periodic dielectric structures of photonic forbidden band, in which the sensing process is carried out through the measurement of variation in signal amplitude as it exits the device. The variation in amplitude is due to a variation in the refraction index of the structure, as a consequence of the presence of the substances that are the object of the sensing. Among the advantages provided by the invention, it is worth mentioning its simplicity in the sensing process; its high level of integration, allowing for a design of reduced proportions; and its adaptability to dielectric structures of one, two or three dimensions.

Abstract: This invention describes a photonic sensing method and device based on the periodic dielectric structures of photonic forbidden band, in which the sensing process is carried out through the measurement of variation in signal amplitude as it exits the device. The variation in amplitude is due to a variation in the refraction index of the structure, as a consequence of the presence of the substances that are the object of the sensing. Among the advantages provided by the invention, it is worth mentioning its simplicity in the sensing process; its high level of integration, allowing for a design of reduced proportions; and its adaptability to dielectric structures of one, two or three dimensions.

Abstract: The invention relates to a method of dividing the power of an input electromagnetic signal into two equal-power signals with a relative phase difference of 180° between them and an equal propagation delay. The inventive method makes use of a photonic crystal coupler comprising two parallel guides which are disposed close to one another and which are based on coupled cavities. The method consists in exciting the odd mode of the coupler which, owing to the symmetry thereof, ensures that the field maxima coincide in one guide with the minima in the adjacent guide, thereby producing a relative phase difference of 180°. The two output signals are obtained through the spatial separation of the guides forming the coupler, making use of the property possessed by guides in photonic crystals for high transmission efficiency through very tight curves. In this way, the size of the structure can be reduced considerably. The inventive method can be used for both two-dimensional and three-dimensional photonic crystals.

Abstract: The invention relates to a method of dividing the power of an input electromagnetic signal into two equal-power signals with a relative phase difference of 180° between them and an equal propagation delay. The inventive method makes use of a photonic crystal coupler comprising two parallel guides which are disposed close to one another and which are based on coupled cavities. The method consists in exciting the odd mode of the coupler which, owing to the symmetry thereof, ensures that the field maxima coincide in one guide with the minima in the adjacent guide, thereby producing a relative phase difference of 180°. The two output signals are obtained through the spatial separation of the guides forming the coupler, making use of the property possessed by guides in photonic crystals for high transmission efficiency through very tight curves. In this way, the size of the structure can be reduced considerably. The inventive method can be used for both two-dimensional and three-dimensional photonic crystals.