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(a) SEM image of photonic crystal: lattice constant , hole radius , . (b) Schematic of the photonic crystal laser composed of photonic crystal and polymer gain medium.
(a) Reflection spectra of a photonic crystal , measured after infiltration with a gain medium and (inset) without a gain medium in air. (b) Band diagrams of the photonic crystal in air (left) and in the gain medium (right). The gray areas represent the photonic band gaps.
(a) Emission spectra of a photonic crystal laser , excited below (upper) and above (lower) threshold. (b) Laser emission spectrum at higher excitation energy. (Inset) Plots of the laser wavelength as a function of the lattice structure of the photonic crystal.
(a) Shift in the calculated band edge wavelengths of a photonic crystal , as a function of the refractive index of the gain medium. (b) Dependence of measured lasing wavelength of a photonic crystal laser on the refractive index of the gain medium.
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