Conference Agenda

TOM9 S02: Opto-electronic Nanotechnologies and Complex Systems: Ligth Matter inetraction
Tuesday, 13/Sept/2022:
2:30pm - 4:00pm

Session Chair: Emilija Petronijevic, Sapienza University of Rome, Italy
Location: B231

2nd floor, 70 seats

2:30pm - 3:00pm
ID: 343 / TOM9 S02: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Light emission from color centers in phosphorus-doped diamond

Florian Sledz1, Assegid M. Flatae1, Stefano Lagomarsino1,2, Savino Piccolomo3, Shannon S. Nickley4,5, Ken Haenen4, Robert Rechenberg6, Michael F. Becker6, Silvio Sciortino2,7, Nicla Gelli2, Lorenzo Giuntini2,7, Giorgio Speranza3, Mario Agio1,8

1University of Siegen, Laboratory of Nano-Optics, 57072 Siegen, Germany; 2Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, 50019 Sesto Fiorentino, Italy; 3Fondazione Bruno Kessler, Centro Materiali e Microsistemi, 38122 Trento, Italy; 4Hasselt University & IMEC, Institute for Material Research (IMO) & IMOMEC, 3590 Diepenbeek, Belgium; 5University of Oxford, Department of Materials, Oxford OX1 2PH, United Kingdom; 6Fraunhofer USA, Center for Coatings and Diamond Technologies, East Lansing, MI 48824, USA; 7University of Florence, Departimento di Fisica e Astronomia, 50019 Sesto Fiorentino, Italy; 8National Research Council (CNR), National Institute of Optics (INO), 50125 Florence, Italy

Light emission from color centers in diamond is being extensively investigated for developing, among other quantum devices, single-photon sources operating at room temperature. By doping diamond with phosphorus, one obtains an n-type semiconductor, which can be exploited for the electrical excitation of color centers. Here, we discuss the optical properties of color centers in phosphorus-doped diamond, especially the silicon-vacancy center, presenting the single-photon emission characteristics and the temperature dependence aiming for electroluminescent single-photon emitting devices.

3:00pm - 3:15pm
ID: 316 / TOM9 S02: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Tunable photoconductive devices based on graphene/WSe2 heterostructures

Hongyu Tang, Giulia Tagliabue

Laboratory of Nanoscience for Energy Technologies (LNET),EPFL, Switzerland

Optoelectronic tunability in van der Waals heterostructures is essential for their optoelectronic applications. In this work, tunable photoconductive properties were investigated in the heterostructures of WSe2 and monolayer graphene with different stacking orders on SiO2/Si substrates. Here, we demonstrated the effect of the material thickness of WSe2 and graphene on the interfacial charge transport, light absorption, and photoresponses. The results showed that the WSe2/graphene heterostructure exhibited positive photoconductivity after photoexcitation, while negative photoconductivity was observed in the graphene/WSe2 heterostructures. The tunable photoconductive behaviors provide promising potential applications of van der Waals heterostructures in optoelectronics. This work has guiding significance for the realization of stacking engineering in van der Waals heterostructures.

3:15pm - 3:30pm
ID: 297 / TOM9 S02: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs

Urban Senica1, Andres Forrer1, Tudor Olariu1, Paolo Micheletti1, Sara Cibella2, Guido Torrioli2, Mattias Beck1, Jérôme Faist1, Giacomo Scalari1

1Quantum Optoelectronics Group, Institute of Quantum Electronics, ETH Zürich, Switzerland; 2Istituto di Fotonica e Nanotecnologie, CNR, Rome, Italy

We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states with strong single beatnotes up to nearly -30 dBm at 90 K, almost three orders of magnitude stronger than for ridge devices. Improved comb operation is maintained also for high operating temperatures, up to 115 K.

3:30pm - 4:00pm
ID: 356 / TOM9 S02: 4
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Photonic metasurfaces for optical manipulation applications

Andrea Di Falco, Tomasz Plaskocinski

University of St Andrews, United Kingdom

Metasurfaces are versatile tools for controlling the behaviour of light through the exact control of light scattering at an interface. Here, we adopt the metasurface technology for optical manipulation applications, using their form factor and light-momentum engineering ability to enable new form of light-matter interactions. The resulting lab-on-chip platform offers unique advantages for biophotonic applications, including single molecule force spectroscopy and biological imaging.