title: Resonantly Increased Optical Frequency Conversion in Atomically Thin Black Phosphorus.
abstract: Optical frequency conversion via the nonlinear effect of third harmonic generation is shown to be resonantly enhanced in few-layer black phosphorus. This feature is believed to be a consequence of exciton-related resonance, as the enhancement is strongly correlated with the observation of exciton-recombination photoluminescence. Few-layer thicknesses are obtained both via mechanical exfoliation and laser thinning.
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.
authors.forename: Manuel J L F
authors.initials: MJ
authors.lastname: Rodrigues
authors.affiliation: MackGraphe - Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, Rua da Consolação 930, São Paulo, SP, 01302-907, Brazil.
authors.forename: Christiano J S
authors.initials: CJ
authors.lastname: de Matos
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.
authors.forename: Yi Wei
authors.initials: YW
authors.lastname: Ho
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.|Centro de Física & Departamento de Física, Universidade do Minho, Campus de Gualtar, Braga, 4710-057, Portugal.
authors.forename: Hélder
authors.initials: H
authors.lastname: Peixoto
authors.affiliation: MackGraphe - Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, Rua da Consolação 930, São Paulo, SP, 01302-907, Brazil.
authors.forename: Rafael E P
authors.initials: RE
authors.lastname: de Oliveira
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.
authors.forename: Hsin-Yu
authors.initials: HY
authors.lastname: Wu
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.
authors.forename: Antonio H Castro
authors.initials: AH
authors.lastname: Neto
authors.affiliation: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546, Singapore, Singapore.
authors.forename: José
authors.initials: J
authors.lastname: Viana-Gomes
keywords: black phosphorus; excitons; nonlinear optics; phosphorene; third-harmonic generation