Multilayer porous silicon spherical Mie resonator photodiodes with comb-like spectral response in the near infrared region

[EN] Silicon microsphere photodiodes constitute optoelectronic devices able to provide resonance-enhanced photo -current not only in the visible but also in the near infrared range by virtue of their associated Mie resonances. They are synthesized by means of a bottom-up process that allows obtaining thousand of devices in a single batch. The microspheres have revealed an internal structural configuration that strongly influences the photo -current response, thus providing an additional degree of freedom for tuning the properties of the photodiodes. Here, devices with a particular internal configuration consisting of a high porous core, a much less porous surrounding layer and a thin non-porous shell, have been studied. They yield comb like peaked photocurrent spectra that have been fitted to a Mie type model. In addition, net energy conversion at 1500 nm has been demonstrated.This work was supported by several projects of the Spanish Ministry of Science, Innovation and Universities: PGC2018-099744-B-100 and SEV-2016-0683 from Severo Ochoa program for Centers of excellence.Fenollosa Esteve, R.; Garín, M. (2022). Multilayer porous silicon spherical Mie resonator photodiodes with comb-like spectral response in the near infrared region. Materials Science in Semiconductor Processing. 150:1-7. https://doi.org/10.1016/j.mssp.2022.1069721715

Low order modes in microcavities based on silicon colloids

[EN] Silicon colloids based microcavities, with sphere size between 1 and 3 micrometers, have been synthesized and optically characterized. Due to both the small cavity volume and the high refractive index of silicon we are able to tune resonances with extremely low mode index, whose electric field distribution resembles those of electronic orbitals. The value of some parameters such as quality factor Q, effective mode volume, and evanescent field have been calculated for several modes. This calculation indicates silicon colloids can be a serious strategy for developing optical microcavities where may coexist both optical modes with large evanescent fields useful for sensing applications, as well as modes with high Q/V ratio values, of the order of 10(9)(lambda/n)(-3). (C) 2011 Optical Society of AmericaThe authors acknowledge financial support from projects Apoyo a la investigacion 2009 from Universidad Politecnica de Valencia, no reg. 4325, FIS2009-07812, Consolider 2007-0046 Nanolight, PROMETEO/2010/043. E. Xifre-Perez acknowledges the financial support from the program Juan de la Cierva (Spanish Ministerio de Educacion y Ciencia). Finally, we thank Prof. J. Garcia de Abajo for providing us with the MESME theoretical program we have used in the calculation of electric field distribution of the Mie modes.Xifre Perez, E.; Fenollosa Esteve, R.; Meseguer Rico, FJ. (2011). Low order modes in microcavities based on silicon colloids. Optics Express. 19(4):3455-3463. https://doi.org/10.1364/OE.19.003455S34553463194Muller, D. A. (2005). A sound barrier for silicon? Nature Materials, 4(9), 645-647. doi:10.1038/nmat1466Song, B.-S., Noda, S., Asano, T., & Akahane, Y. (2005). Ultra-high-Q photonic double-heterostructure nanocavity. Nature Materials, 4(3), 207-210. doi:10.1038/nmat1320Blanco, A., Chomski, E., Grabtchak, S., Ibisate, M., John, S., Leonard, S. W., … van Driel, H. M. (2000). Large-scale synthesis of a silicon photonic crystal with a complete three-dimensional bandgap near 1.5 micrometres. Nature, 405(6785), 437-440. doi:10.1038/35013024Song, B.-S. (2003). Photonic Devices Based on In-Plane Hetero Photonic Crystals. Science, 300(5625), 1537-1537. doi:10.1126/science.1083066Ashkin, A., & Dziedzic, J. M. (1977). Observation of Resonances in the Radiation Pressure on Dielectric Spheres. Physical Review Letters, 38(23), 1351-1354. doi:10.1103/physrevlett.38.1351Ashkin, A., & Dziedzic, J. M. (1981). Observation of optical resonances of dielectric spheres by light scattering. Applied Optics, 20(10), 1803. doi:10.1364/ao.20.001803Painter, O. (1999). Two-Dimensional Photonic Band-Gap Defect Mode Laser. Science, 284(5421), 1819-1821. doi:10.1126/science.284.5421.1819Armani, D. K., Kippenberg, T. J., Spillane, S. M., & Vahala, K. J. (2003). Ultra-high-Q toroid microcavity on a chip. Nature, 421(6926), 925-928. doi:10.1038/nature01371Inoue, K., Sasaki, H., Ishida, K., Sugimoto, Y., Ikeda, N., Tanaka, Y., … Asakawa, K. (2004). InAs quantum-dot laser utilizing GaAs photonic-crystal line-defect waveguide. Optics Express, 12(22), 5502. doi:10.1364/opex.12.005502Fenollosa, R., Meseguer, F., & Tymczenko, M. (2008). Silicon Colloids: From Microcavities to Photonic Sponges. Advanced Materials, 20(1), 95-98. doi:10.1002/adma.200701589Stöber, W., Fink, A., & Bohn, E. (1968). Controlled growth of monodisperse silica spheres in the micron size range. Journal of Colloid and Interface Science, 26(1), 62-69. doi:10.1016/0021-9797(68)90272-5Conwell, P. R., Barber, P. W., & Rushforth, C. K. (1984). Resonant spectra of dielectric spheres. Journal of the Optical Society of America A, 1(1), 62. doi:10.1364/josaa.1.000062Ng, J., Chan, C. T., Sheng, P., & Lin, Z. (2005). Strong optical force induced by morphology-dependent resonances. Optics Letters, 30(15), 1956. doi:10.1364/ol.30.001956Vahala, K. J. (2003). Optical microcavities. Nature, 424(6950), 839-846. doi:10.1038/nature01939García de Abajo, F. J. (1999). Interaction of Radiation and Fast Electrons with Clusters of Dielectrics: A Multiple Scattering Approach. Physical Review Letters, 82(13), 2776-2779. doi:10.1103/physrevlett.82.2776Xifré-Pérez, E., García de Abajo, F. J., Fenollosa, R., & Meseguer, F. (2009). Photonic Binding in Silicon-Colloid Microcavities. Physical Review Letters, 103(10). doi:10.1103/physrevlett.103.103902Tanaka, Y., Asano, T., & Noda, S. (2008). Design of Photonic Crystal Nanocavity With $Q$-Factor of ${{\sim}10^{9}}$. Journal of Lightwave Technology, 26(11), 1532-1539. doi:10.1109/jlt.2008.923648Takahashi, Y., Tanaka, Y., Hagino, H., Sugiya, T., Sato, Y., Asano, T., & Noda, S. (2009). Design and demonstration of high-Q photonic heterostructure nanocavities suitable for integration. Optics Express, 17(20), 18093. doi:10.1364/oe.17.018093Kippenberg, T. J., Spillane, S. M., & Vahala, K. J. (2004). Demonstration of ultra-high-Q small mode volume toroid microcavities on a chip. Applied Physics Letters, 85(25), 6113-6115. doi:10.1063/1.1833556Braginsky, V. B., Gorodetsky, M. L., & Ilchenko, V. S. (1989). Quality-factor and nonlinear properties of optical whispering-gallery modes. Physics Letters A, 137(7-8), 393-397. doi:10.1016/0375-9601(89)90912-

Formulación que comprende micropartículas de silicio como pigmento absorbente de la radiación UV-visible y reflectante de la radiación IR

La presente invención se refiere a una formulación caracterizada porque comprende micropartículas de silicio con un tamaño comprendido entre 0,1 μm y 50 μm de diámetro, así como a su uso como pigmento absorbente de la radiación UV-visible y reflectante de la radiación IR.Peer reviewedConsejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, ONA Investigación S.L.A1 Solicitud de patente con informe sobre el estado de la técnic

Thermal Emission of Silicon at Near-Infrared Frequencies Mediated by Mie Resonances

[EN] Planck's law constitutes one of the cornerstones in physics. It explains the well-known spectrum of an ideal blackbody consisting of a smooth curve, whose peak wavelength and intensity depend on the temperature of the body. This scenario changes drastically, however, when the size of the emitting object is comparable to the wavelength of the emitted radiation. Here we show that a silicon microsphere (2-3 mu m in diameter) heated to around 800 degrees C yields a thermal emission spectrum consisting of pronounced peaks that are associated with Mie resonances. We experimentally demonstrate in the near-infrared the existence of modes with an ultrahigh quality factor, Q, of 400, which is substantially higher than values reported so far, and set a new benchmark in the field of thermal emission. Simulations predict that the thermal response of the microspheres is very fast, about 15 mu s. Additionally, the possibility of achieving light emission above the Planck limit at some frequency ranges is envisaged.This work was supported by several projects of the Spanish Ministry of Economy and Competitiveness (MINECO), Severo Ochoa program for Centers of Excellence (SEV-2016-0683), MAT2015-69669-PM, ENE2013-49984-EXP, ENE2015-74009-JIN (cofunded by the European Regional Development Fund), and of the Spanish Science, Innovation and Universities, PGC2018-099744-B-100. F.R.-M. thanks the financial contribution of MINECO through the program for young researchers support, TEC 2015 2015-74405-JIN. The authors greatly acknowledge the contribution of Prof. Francisco Meseguer for both the fruitful discussions and the revision of the manuscript, and Prof. Marie Louise McCarrey for careful proofreading of the manuscript.Fenollosa Esteve, R.; Ramiro-Manzano, F.; Garín Escrivá, M.; Alcubilla, R. (2019). Thermal Emission of Silicon at Near-Infrared Frequencies Mediated by Mie Resonances. ACS Photonics. 6(12):3174-3179. https://doi.org/10.1021/acsphotonics.9b01513S3174317961

Angle-Dependent Quality Factor of Mie Resonances in Silicon-Colloid-Based Microcavities

[EN] Semiconductor photonic microcavities are currently very important elements in the field of photonics. We here report the light-trapping ability of 3D silicon spherical micrometer-sized photonic cavities, which are fabricated via simple chemical methods, aThe authors acknowledge financial support from the following projects: MAT2012-35040, FIS2009-07812, Consolider 2007- 0046 Nanolight, and the PROMETEO/2010/043. L.S. thanks the MICINN (Estancias de Profesores e Investigadores Extranjeros en Centros Españoles) fellowship program, the Starting Foundation from Fudan University, the NSFC, and the Shanghai Science and Technology Commission for their financial support.Shi, L.; Fenollosa Esteve, R.; Tuzer, TU.; Meseguer Rico, FJ. (2014). Angle-Dependent Quality Factor of Mie Resonances in Silicon-Colloid-Based Microcavities. ACS Photonics. 1(5):408-412. https://doi.org/10.1021/ph400134tS4084121

Magnetic light and forbidden photochemistry: the case of singlet oxygen

[EN] Most optical processes occurring in nature are based on the well-known selection rules for opticaltransitions between electronic levels of atoms, molecules, and solids. Since in most situations themagnetic component of light has a negligible contribution, the dipolar electric approximation isgenerally assumed. However, this traditional understanding is challenged by nanostructured materials,which interact strongly with light and produce very large enhancements of the magnetic field in theirsurroundings. Here we report on the magnetic response of different metallic nanostructures and theirinfluence on the spectroscopy of molecular oxygen, a paradigmatic example of dipole-forbidden optical transitions in photochemistryA. M. acknowledge support from U. S. National Science Foundation (Grant ECCS-1710697). The authors acknowledge the financial support from the following projects: CTQ2014-61671-EXP, MAT2015-69669-P, and PrometeoII/2017/026. 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Single Crystal Growth of Hybrid Lead Bromide Perovskites Using a Spin-Coating Method

[EN] Synthesis and studies of single crystals of hybrid perovskite are important for achieving a better understanding of the optoelectronic phenomena occurring in this material and for improving ongoing applications. Here, we report on the growth of micrometer-size single crystals of methylammonium lead bromide (MAPbBr3) using the spin coating deposition method on a quartz substrate. We studied the influence of the rotation speed and the use of three different additives N-cyclohexyl-2-pyrrolidone, dimethyl sulfoxide, and 4-tert-butylpyridine on the crystal size and shape. The introduction of an additive in the precursor solution is revealed to be very useful for obtaining crystals with well-defined geometries and for decreasing the amount of defects. In this way, high-quality single crystals that sustain optical resonating modes were obtained and characterized by transmittance and photoluminescence measurements.Financial support from the Spanish Ministry of Economy and Competitiveness (Severo Ochoa, SEV-2016-0683), Intramural CSIC project 201680I006, and Fundacion Ramon Areces (XVII Concurso Nacional para la adjudicacion de Ayudas a la Investigacion en Ciencias de la Vida y de la Materia) is gratefully acknowledged. Financial support was also provided by the Spanish Ministry of Economy and Competitiveness (Mineco) of Spain (TEC2015-74405-JIN), MAT2015-69669-P, and regional government grant PrometeoII/2017/026.García-Aboal, R.; Fenollosa Esteve, R.; Ramiro Manzano, F.; Rodriguez, I.; Messeguer Rico, FJ.; Atienzar Corvillo, PE. (2018). Single Crystal Growth of Hybrid Lead Bromide Perovskites Using a Spin-Coating Method. ACS Omega. 3(5):5229-5236. https://doi.org/10.1021/acsomega.8b00447S522952363

Groove-assisted solution growth of lead bromide perovskite aligned nanowires: a simple method towards photoluminescent materials with guiding light properties

[EN] High refractive index nanowires are very attractive because of their waveguiding properties and their multiple applications. In this sense, metal halide perovskites, an emerging and appealing optoelectronic material, have also been tailored into nanowire structures. Here, we present an easy, low-cost and versatile method that has made possible to achieve nanowires of controlled and uniform width. The method has been applied here to all-inorganic and hybrid lead bromide perovskite (CsPbBr3 and CH3NH3PbBr3 respectively) materials. The procedure is based on the spin coating of precursor solutions, at room temperature, on a PDMS replica of the periodic grooves and lands of commercially available Compact Disc (CD) or Digital Versatile Disc (DVD) polycarbonate plates. The method can be applied for the synthesis of other material nanowires before being transferred onto other substrates. The obtained CsPbBr3 and CH3NH3PbBr3 nanowires exhibit high photoluminescence and guiding light properties along the material.The authors would like to gratefully acknowledge the financial support from the Spanish Ministry of Economy and Competitiveness (MIMECO) (Severo Ochoa (SEV-2016-0683), MAT2015-69669-P projects) and Generalitat Valenciana (Prometeo II/2017/026 Excellency project). P. A. acknowledges the Fundacion Ramon Areces (XVII Concurso Nacional para la adjudicacion de Ayudas a la Investigacion en Ciencias de la Vida y de la Materia) for its funding. F. R.-M. thanks the financial contribution of the Spanish Ministry of Economy and Competitiveness (MIMECO) through the program for young researchers support (TEC 2015 2015-74405-JIN). Finally, IR also thanks the Electron Microscopy Service of the Universitat Politecnica de Valencia for their support in FESEM image acquisition and FIB milling, as well as Ana Moreno for her help in template preparation.Rodriguez, I.; Fenollosa Esteve, R.; Ramiro Manzano, F.; García-Aboal, R.; Atienzar Corvillo, PE.; Meseguer Rico, FJ. (2019). Groove-assisted solution growth of lead bromide perovskite aligned nanowires: a simple method towards photoluminescent materials with guiding light properties. Materials Chemistry Frontiers. 3(9):1754-1760. https://doi.org/10.1039/c9qm00210cS1754176039Semiconductor nanowires: From next-generation Electronics to Sustainable Energy , ed. W. Lu and J. Xiang , RSC Smart Materials Series, 2015Semiconductor Nanowires, Materials, Synthesis, Characterization and Applications , ed. J. Arbiol and Q. Xiong , Woodhead Publishing , 2015Peng, K.-Q., Wang, X., Li, L., Hu, Y., & Lee, S.-T. (2013). Silicon nanowires for advanced energy conversion and storage. 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ACS Omega, 3(5), 5229-5236. doi:10.1021/acsomega.8b00447Fenollosa, R., Garín, M., & Meseguer, F. (2016). Spherical silicon photonic microcavities: From amorphous to polycrystalline. Physical Review B, 93(23). doi:10.1103/physrevb.93.23530

Light harvesting by a spherical silicon microcavity

Silicon colloids are presented as efficient absorbers in the VIS-NIR region. The theory of resonant absorption by Mie modes in a single high-index sphere is reviewed and engineering rules established. The presented model predicts enhanced absorption in the crystalline silicon band-to-band absorption region, with absorption efficiencies exceeding one in the VIS and excellent NIR response. A maximum resonant absorption efficiency close to 4 can be obtained at the violet region (425 nm), and values above 0.25 are possible in the bandgap edge at wavelengths up to 1400 nm. Silicon colloids are proposed as a promising cost-effective, silicon saving, sunlight harvesters with improved VIS and NIR response.Postprint (author's final draft

Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry-Perot resonances

[EN] A precise knowledge of the optical properties, specifically the refractive index, of organic/inorganic perovskites, is essential for pushing forward the performance of the current photovoltaic devices that are being developed from these materials. Here we show a robust method for determining the real and the imaginary part of the refractive index of MAPbBr(3) thin films and micrometer size single crystals with planar geometry. The simultaneous fit of both the optical transmittance and the photoluminescence spectra to theoretical models defines unambiguously the refractive index and the crystal thickness. Because the method relies on the optical resonance phenomenon occurring in these microstructures, it can be used to further develop optical microcavities from perovskites or from other optical materials.This work was supported by the Spanish ministry of Economy, Industry and Competitiveness (MINECO) through the projects TEC2015-74405-JIN, MAT2015-69669-P as well as the regional projects of both Provincia Autonoma di Trento (PAT) of Italy, through the call Grandi Progetti 2012: SIQURO and the Comunidad Valenciana of Spain project PrometeoII/2014/026.Ramiro Manzano, F.; García-Aboal, R.; Fenollosa Esteve, R.; Biasi, S.; Rodriguez, I.; Atienzar Corvillo, PE.; Meseguer Rico, FJ. (2020). Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry-Perot resonances. Dalton Transactions. 49(36):12798-12804. https://doi.org/10.1039/d0dt02254c1279812804493