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Absorption mechanisms in macroporous silicon photonic crystals
dc.contributor.author | Segura García, Daniel |
dc.contributor.author | Cardador Maza, David |
dc.contributor.author | Rodríguez Martínez, Ángel |
dc.contributor.author | Llorca Piqué, Jordi |
dc.contributor.other | Universitat Politècnica de Catalunya. Doctorat en Enginyeria Electrònica |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química |
dc.date.accessioned | 2020-03-04T11:15:10Z |
dc.date.available | 2022-03-01T01:27:13Z |
dc.date.issued | 2019-01-01 |
dc.identifier.citation | Segura, D. [et al.]. Absorption mechanisms in macroporous silicon photonic crystals. "Sensors and actuators A. Physical", 1 Gener 2019, vol. 303, p. 111698:1-111698:7. |
dc.identifier.issn | 0924-4247 |
dc.identifier.uri | http://hdl.handle.net/2117/179182 |
dc.description.abstract | We investigate the large differences classically found in literature between theoretical and empirical results in the optical characterization of macroporous silicon photonic crystals. Mainly, we study the impact of two optical absorption mechanisms, free carrier absorption and scattering. Optical measurements with different membranes and previously reported data have been compared with numerical simulations. Results show that free carrier absorption is irrelevant for the used bulk doping. Nevertheless, the implanted N+ ohmic contact imposes a high absorption in the long-infrared region, leading to a 40 % decrease in transmission. Concerning scattering, we demonstrate that error/deviations in the etching of the photonic crystals –such as branching or spiking–, with sizes comparable to the modulation radius, are responsible for Lambertian light trapping. This absorption mechanism is dominant for wavelengths shorter than the bandgap ones, regardless of the horizontal periodicity used, due to the size dependence between error/deviation and modulation radius. |
dc.language.iso | eng |
dc.publisher | Elsevier |
dc.subject | Àrees temàtiques de la UPC::Enginyeria electrònica |
dc.subject.other | Macroporous silicon |
dc.subject.other | Photonic crystals |
dc.subject.other | Optical absorption |
dc.subject.other | Free carrier absorption |
dc.subject.other | Lambertian light trapping |
dc.title | Absorption mechanisms in macroporous silicon photonic crystals |
dc.type | Article |
dc.subject.lemac | Cristalls fotònics |
dc.subject.lemac | Cristalls de silici |
dc.contributor.group | Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies |
dc.contributor.group | Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia |
dc.identifier.doi | 10.1016/j.sna.2019.111698 |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/abs/pii/S0924424719312178 |
dc.rights.access | Open Access |
local.identifier.drac | 26427801 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Segura, D.; Cardador, D.; Rodriguez, A.; Llorca, J. |
local.citation.publicationName | Sensors and actuators A. Physical |
local.citation.volume | 303 |
local.citation.startingPage | 111698:1 |
local.citation.endingPage | 111698:7 |
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