March 20, 2017
March 17, 2017
2D layered materials are like color papers: they can be glued, stacked, cut and folded to form integrated devices with atomic thickness. In this talk, I will first discuss how different 2D materials can be grown with distinct electrical and optical properties (coloring), how they can be connected laterally to form pattered circuits (stitching) and how their interaction with light can be designed by controlling the interlayer rotation and the valley degree of freedom (twisting). Then I will discuss our recent efforts to turn these 2D “papers” into 3D structures.
Seminar, March 20, 2017, 12:00. ICFO’s Seminar Room
Hosted by Prof. Adrian Bachtold
March 7, 2017
Underscoring the wealth of graphene research and development activity taking place in the Barcelona area, the 7th edition of Graphene Conference will now take place from the 28th until the 31st of March 2017 at the Barcelona International Convention Center (CCIB). This is the world’s largest graphene conference, bringing together both scientists and industry to work towards integrating new graphene technologies into current applications. Mr. Francesc Subirada, General Director for Research of the Catalan Ministry of Business and Knowledge, will participate in the event Opening.
During this 4 day-long conference, around 1000 attendees will have the opportunity to listen to approximately 100 prestigious keynote and invited talks, more than 150 oral and around 400 posters presentations. The event will also create many networking opportunities for future collaborations. The top class speakers will include Prof. Albert Fert, awarded the Nobel Prize in Physics 2007 for the discovery of giant magnetoresistance, and Prof. Andre Geim, awarded the Nobel Prize in Physics in 2010 for his ground-breaking experiments regarding the two-dimensional material graphene.
The general conference includes two parallel events focused on industry and knowledge transfer. Attendees will have the opportunity to visit the exhibition area and interact with both local and international participants, including booths where companies and research institutes like ICN2 and ICFO will be presenting their graphene-based technologies. Among the exhibitors, visitors will find Pavilions devoted to initiatives from as far away as Canada, Malaysia and China participating in this conference with a global impact.
ICFO- the Institute of Photonic Sciences and ICN2- the Catalan Institute of Nanoscience and Nanotechnology, both scientific organizers of the Conference are research centers, founding members of BIST- the Barcelona Institute of Science and Technology, world renowned for their expertise in graphene and 2D materials research and graphene related technologies. In addition, the event organizing committee includes experts from UCL – Université Catholique de Louvain and IIT – Italian Institute of Technology. The event main organizer, Phantoms Foundation, began organizing these series of events in 2011 and since then has brought together more than 3500 participants from over 60 countries.
March 3, 2017
Optical sensing in the short-wave and mid- infrared is of paramount importance for a vast number of applications including surveillance, night vision, product, process and environmental monitoring and spectroscopy.
Yet existing technologies, particu…
February 27, 2017
Organized by the Graphene Flagship, curated by ICFO, and supported by GSMA, the Graphene Experience Zone at the Mobile World Congress 2017 (MWC17), the largest Mobile Industry event, demonstrated that graphene research is indeed headed in the right direction with cutting-edge graphene based technological applications moving closer to market.
Now in its second year appearing at the MWC, this year’s Graphene Zone was divided into five large technological areas: IoT and sensors, Wearables and Health, Energy, Datacoms and Composites. During four days of non-stop activity, 26 institutes and companies showcased 20 technologies, demos and applications to a continuous stream of visitors, press and companies interested in seeing graphene at work in operational prototypes.
The exhibiting technologies ranged from IR sensors for car collision avoidance systems, wearable wellness sensing devices, flexible displays, force sensors, and super capacitors to an artificial arm, a retina- optical nerve implant, strain sensors for insoles, conductive inks and instant heating systems for extreme weather conditions, among others.
In parallel to the exhibits, two other main activities took place within this massive Mobile Industry encounter. On March 2nd, there was the workshop ‘Graphene Connect: From Datacom to IoT, Enabled by Graphene’, which opened with an address by Nobel Laureate Prof. Konstantin Novoselov. The workshop aimed to bring together academic and industry representatives with an interest in all things mobile, offering networking opportunities to facilitate possible future collaborations. Secondly, ICFO partnered with IIT, Novalia and University of Cambridge, all members of the Graphene Flagship, to create and coordinate the activity “Graphopolis”, an event that took place during the Youth Mobile Festival (YoMo) that same week. Aimed at raising awareness in young generations about the potential of graphene and its applications, this activity encouraged participants to create their own futuristic city by thinking, exploring and creating graphene-based technologies that could improve quality of urban life.
After witnessing the enthusiastic reaction of visitors to the stand, exhibitors of the Graphene Experience Zone agree that we are on the right track, moving forward into a phase of industrialization in which graphene is finally advancing from the research lab to the manufacturing plants.
February 27, 2017
Electronic and optical processes in nanoscale devices produce large concentration of heat, which can limit their performance and cause structural damage. Heat management at this scale is thus one of the main burdens in the design of nanodevices, which is typically dealt with by using conventional thermal conductivity to cool the involved material. This however is a relatively slow and harmful procedure.
In a paper entitled “Ultrafast radiative heat transfer”, published today in Nature Communications, Renwen Yu, Alejandro Manjavacas and ICREA Professor at ICFO Javier García de Abajo, leader of the Nanophotonics Theory Group, use the extraordinary optical and thermal properties of graphene to show that radiative heat transfer is a cleaner process that does not involve undesired inelastic excitations of the materials. Likewise, it occurs at a much faster pace than heating of the atomic lattice.
The extreme concentration of electromagnetic energy associated with graphene plasmons -the collective electron excitations of this material- combined with its record-low electronic heat capacity -a property arising from the unique electronic structure of graphene- allow researchers to show that more than 50% of the electronic heat accumulated by a graphene island can be transferred within a few hundred femtoseconds to a cooler neighboring island. This unexpected finding leads to an unprecedented situation, as all previous experimental and theoretical radiative heat transfer studies have claimed that radiative transfer occurs at a rate that is orders of magnitude lower than heat diffusion through the atomic lattice. Apart from its interest from a fundamental viewpoint, this discovery shows that radiative heat transfer using graphene and other atomically thin materials is bound to profoundly transform the way nanoscale devices are designed.
February 22, 2017
Graphene is back at Mobile World Congress (MWC) 2017 with the Graphene Experience Zone. Designed to showcase graphene mobile innovation in an interactive way, the Graphene Experience Zone will bring graphene to life. A wide range of demonstrations and …
February 2, 2017
In the wake of graphene, a large family of layered materials has (re-)emerged as an outstanding playground to investigate the interplay between photons, electrons and phonons in the (quasi) two-dimensional (2D) limit. In particular, graphene, as a 2D s…
January 18, 2017
Dirac fermions possess emergent quantum mechanical behavior that can give rise to new, and unusual opto-electronic properties. One striking example is Berry curvature in “topologically”-flavored two-dimensional gapped Dirac materials (GDMs, e.g., TMDs,…
December 12, 2016
2-Dimensional (2D) graphene emerged as an outstanding material for plasmonic and photonic applications due to its huge charge-density tunability, high electron mobility, and optical transparency. Recently, novel fabrication processes allowed to obtain three-dimensional (3D) structures based on high-quality monolayer graphene which provide a third dimension to this material.
Actually, many different 3D structures have been produced, spanning from 3D nanoporous graphene and nano-onions to 3D micro-network and nano-sponges, all retaining the unique characteristics of 2D graphene including massless Dirac fermions with high mobility.
In this talk, after a brief review on the different 3D structures of graphene, I will focalize the discussion on nanoporous and sponge materials.
In nanoporous graphene, we reveal the presence of intrinsic 2D Dirac plasmons in the 3D structure disclosing strong plasmonic absorptions tunable from terahertz to mid-infrared via controllable doping level and porosity. The observed broad plasmon linewidths allow to cover most of the molecular mid-infrared fingerprint region with a single plasmon excitation paving the way for novel and competitive nanoporous-graphene based plasmonic-sensors.
In 3D aerogel sponge instead, we have shown that intensity modulated light can be transduced in acoustic waves through a photo thermal-acoustic mechanism. The unique combination of thermal, mechanical and electronic properties of graphene sheets arranged in the 3D sponge structure allows to achieve a high sound generation efficiency being practically independent of the light wavelength from radio waves to ultraviolet. The present results suggest that light-driven graphene-sponge based-devices could be widely used in a variety of new technological applications spanning from high-fidelity loudspeaker to radiation detectors.
Seminar, January 18, 2017, 12:00. ICFO’s Seminar Room
Hosted by Prof. Javier García de Abajo
December 5, 2016
The isolation of graphene, now over a decade ago, has given rise to the revitalization of many two-dimensional materials (2DM). The 2DM materials under investigation, in addition to graphene, include hexagonal boron nitride (h-BN), semiconducting, meta…
October 6, 2016
An international group of experts led by the University of Minnesota, including ICREA Prof at ICFO Frank Koppens, have published a study in Nature Materials entitled “Polaritons in layered two-dimensional materials” which highlights how man…
Cavity-polaritons have emerged as an exciting platform for studying interacting bosons in a driven-dissipative setting. Typically, the experimental realization of exciton-polaritons is based on undoped GaAs quantum wells (QW) embedded in between two mo…