The development of optical and, in particular, photoluminescent sensors is currently becoming more and more significant because of their universality, selectivity, and high sensitivity ensuring their wide applications in practice. The efficiency of existing photoluminescent sensors can be increased by using photoluminescent nanomaterials and hybrid nanostructures. For biological applications of photoluminescent sensors, it is extremely relevant to excite photoluminescence in the near infrared spectral range, which allows excluding the effect of autofluorescence of biomolecules and ensuring a deeper penetration of radiation into biological tissues. In this work, it has been studied how the spectral and kinetic parameters of photoluminescence change under two-photon excitation of semiconductor quantum dots incorporated into a one-dimensional photonic crystal, a porous silicon microcavity. It has been shown that the formation of a weak coupling between an exciton transition in quantum dots and an eigenmode of the microcavity enhances the photoluminescence of quantum dots. It is important that quantum dots placed in the porous silicon matrix hold a sufficiently large cross section for two-photon absorption, which makes it possible to efficiently excite their exciton states up to saturation without reaching powers leading to the photothermic destruction of the structure of porous silicon and to the disappearance of the weak coupling effect. It has been demonstrated that the radiative recombination rate under the two-photon excitation of the system consisting of quantum dots and the microcavity increases by a factor of 4.3; it has been shown that this increase is due to the Purcell effect. Thus, fabricated microcavities based on 1D porous silicon crystals allow controlling the quantum yield of photoluminescence of quantum dots under two-photon excitation, which opens prospects for the development of new photoluminescent sensors based on quantum dots operating in the near infrared spectral range.

光学传感器，特别是光致发光传感器的发展，由于其通用性，选择性和高灵敏度，确保了其在实践中的广泛应用，目前正变得越来越重要。通过使用光致发光纳米材料和混合纳米结构，可以提高现有的光致发光传感器的效率。对于光致发光传感器的生物应用，与激发近红外光谱范围内的光致发光极为相关，这可以排除生物分子的自发荧光作用，并确保辐射更深地渗透到生物组织中。在这项工作中 已经研究了在并入一维光子晶体，多孔硅微腔中的半导体量子点的双光子激发下，光致发光的光谱和动力学参数如何变化。已经表明，在量子点中的激子跃迁与微腔的本征模之间的弱耦合的形成增强了量子点的光致发光。重要的是，放置在多孔硅基质中的量子点必须具有足够大的横截面以吸收双光子，这使得可以有效地激发其激子态直至饱和，而不会达到导致多孔结构光热破坏的能力硅与去耦效应消失。已经证明，在由量子点和微腔组成的系统的双光子激发下的辐射复合率增加了4.3倍。已经表明，这种增加是由于珀塞尔效应引起的。因此，基于一维多孔硅晶体制造的微腔可以控制双光子激发下量子点的光致发光量子产率，这为基于在近红外光谱范围内工作的量子点的新型光致发光传感器的开发开辟了前景。