Plasmonically enhanced upconversion of 1500 nm light via trivalent Er in a TiO2 matrix
Harish Lakhotiya, Adnan Nazir, Søren P. Madsen, Jeppe Christiansen, Emil Eriksen, Joakim Vester-Petersen, Sabrina R. Johannsen, Bjarke Rolighed Jeppesen, Peter Balling, Arne Nylandsted Larsen, and Brian Julsgaard, Appl. Phys. Lett. 109, 263102 (2016)

Periodically arranged colloidal gold nanoparticles for enhanced light harvesting in organic solar cells
M. Mirsafaei, A. L. F. Cauduro, C. Kunstmann-Olsen, A. M. Davidson, S. Hassing, M. A. B. Hedegaard, H.-G. Rubahn, J. Adam, and M. Madsen, SPIE Proc. 9898, 989810 (2016)

Erbium diffusion in titanium dioxide
Louise Basse, John Lundsgaard Hansen, Pia Bomholt Jensen, and Brian Julsgaard, AIP Adv. 7, 045202 (2017)

Particle-particle interactions in large, sparse arrays of randomly distributed plasmonic metal nanoparticles: a two-particle model
Emil H. Eriksen, Brian Julsgaard, Søren P. Madsen, Harish Lakhotiya, Adnan Nazir, and Peter Balling, Opt. Express 25, 19354 (2017)

The influence of electrical effects on device performance of organic solar cells with nano-structured electrodes
M. Mirsafaei, A. H. Fallahpour, P. Lugli, H.-G. Rubahn, J. Adam, and M. Madsen, Sci. Rep. 7, 5300 (2017)

Topology optimized gold nanostrips for enhanced near-infrared photon upconversion
Joakim Vester-Petersen, Rasmus E. Christiansen, Brian Julsgaard, Peter Balling, Ole Sigmund, and Søren P. Madsen, Appl. Phys. Lett. 111, 133102 (2017)

Near-field marking of gold nanostars by ultrashort pulsed laser irradiation: experiment and simulations
Søren H. Møller,Joakim Vester-Petersen, Adnan Nazir, Emil H. Eriksen, Brian Julsgaard, Søren P. Madsen, and Peter Balling, Appl. Phys. A (2018)

Enhanced upconversion in one-dimensional photonic crystals: a simulation-based assessment within realistic material and fabrication constraints
C. Hofmann, E. Eriksen, S. Fischer, B. Richards, P. Balling, J. Goldschmidt, Opt. Express 26, 7537 (2018)

Field-enhancing photonic devices utilizing waveguide coupling and plasmonics - a selection rule for optimization-based design
Joakim Vester-Petersen,  Søren P. Madsen, Ole Sigmund,  Peter Balling,  Brian Julsgaard, and  Rasmus E. Christiansen, Opt. Express 26, A788-A795 (2018)

Non-linear material interpolation for design of metallic nano-particles using topology optimization
Rasmus E. Christiansen, Joakim Vester-Petersen, Søren P. Madsen, and Ole Sigmund, Comput. Methods Appl. Mech. Engrg 343, 23-39 (2019)

Time-resolved infrared photoluminescence spectroscopy using parametric three-wave mixing with angle-tuned phase matching
Søren Roesgaard, Lichun Meng, Peter Tidemand-Lichtenberg, Jeppe Seidelin Dam, Peter John Rodrigo, Christian Pedersen, and Brian Julsgaard, Optics Letters 43, 3001-3004 (2018)

Femtosecond-laser-induced modifications of Ge2Sb2Te5 thin films: Permanent optical change without amorphization
Søren H. Møller, Emil H. Eriksen, Peter L. Tønning, Pia B. Jensen, Jacques Chevallier, Peter Balling, Appl. Surf. Sci. 476, 221-231 (2019)

Enhanced upconversion via plasmonic near-field effects: role of the particle shape
Emil H Eriksen, Søren P Madsen, Brian Julsgaard, Clarissa L M Hofmann, Jan Christoph Goldschmidt, and Peter Balling, J. Opt. 21, 035004 (2019)

Upconversion luminescence from magnetron-sputtered Er3+-doped TiO2 films: Influence of deposition- and annealing temperatures and correlation to decay times
H. Lakhotiya, J. Christiansen, J. L. Hansen, P. Balling, B. Julsgaard, J. Appl. Phys. 124, 163105 (2018)

Improving the efficiency of solar cells by upconverting sunlight using field enhancement from optimized nano structures
P. Balling, J. Christiansen, R. E. Christiansen, E. Eriksen, H. Lakhotiya, M. Mirsafaei, S. H. Møller, A. Nazir, J. Vester-Petersen, B. R. Jeppesen, P. B. Jensen, J. L. Hansen, S. K. Ram, O. Sigmund, M. Madsen, S. P. Madsen, B. Julsgaard, Opt. Mater. Express, 83, 279-289 (2018)

Dose regularization via filtering and projection: An open-source code for optimization-based proximity-effect-correction for nanoscale lithography
Emil H. Eriksen; Adnan Nazir; Peter Balling; Joakim Vester-Petersen; Rasmus E. Christiansen; Ole Sigmund; Søren P. Madsen, Microelectronic Engineering, 199, 52-57 (2018)

Resonant Plasmon-Enhanced Upconversion in Monolayers of Core-Shell Nanocrystals: Role of Shell Thickness
H. Lakhotiya, A. Nazir, S. Roesgaard, E. Eriksen, J. Christiansen, M. Bondesgaard, F. C. J. M. van Veggel, B. B. Iversen, P. Balling, and B. Julsgaard, ACS Appl. Mat. Inter. 11, 1209 (2019)

Analytical model for the intensity dependence of 1500 nm to 980 nm upconversion in Er3+ : a new tool for material characterization
J. Christiansen, H. Lakhotiya, E. Eriksen, S. P. Madsen, P. Balling, and B. Julsgaard, J. Appl. Phys. 125, 043106 (2019)