We are currently looking for 2 new colleagues at imecc to strengthen our team for real-time holography applications. We are currently looking for a Senior mixed signal circuit design engineer and a System architect. Are you looking for a new and exciting, multidisciplinary challenge?
Our latest paper, entitled “Electric-field-controlled reversible order-disorder switching of a metal tip surface” has been published in Physical Review Materials.
In this work led by Ludvig de Knoop and Mikael Juhani Kuisma, the deformation at the very tip of a gold nanocone was studied on the atomic level using TEM (transmission electron microscopy). When a large electric field is applied, the topmost atomic layers of the cone make a reversible switch from a crystalline to a disordered state. When the electric field exceed a threshold of about 25V/nm, gold atoms can be evaporated from the tip at room temperature. These observations were also studied using ab initio molecular dynamics (AIMD) simulations, which were in excellent agreement with the measured data.
The samples for these experiments were fabricated during one of my last work days at Chalmers, using our transfer protocol to decorate a gold wire with a pattern of nanocones for use in the TEM experiments.
On July 5th, I will be presenting some recent results at the Advanced Photonics Congress in Zurich about our Niobium Oxide based waveguide platform for visible light applications. This platform we are developing at imec has the advantage that the refractive index of Niobium Oxide is significantly larger than that one of Silicon Nitride, the most common waveguide platform in this wavelength range. Increasing the refractive index of a waveguide allows to scale down the component sizes significantly, allowing to increase the density of photonic integrated circuits.
More details can be found in our abstract or at the conference.
Our latest paper entitled Grating Coupler Design for Reduced Back-Reflections just got published in IEEE Photonics Technology Letters.
This work was led by my colleague Jeong Hwan Song and it illustrates how efficient grating couplers with low back reflections can be made in our silicon nitride waveguide platform. In many photonic applications, back-reflections from the grating couplers can result in undesired interferences in the components that are being tested. By designing asymmetric grating couplers, these back reflections can be suppressed by over 5 dB with almost no impact on the coupling efficiency.
Our latest paper entitled Multiscale Conformal Pattern Transfer just got published in Scientific Reports.
In this work we show a very versatile platform for decorating 3D objects with nano- or microscale-structures, by means of a transfer lithography protocol. The structures to be transferred are first defined by means of a conventional lithography method of choice on top of 10 nm thick amorphous carbon film on top of a sacrificial layer. After submerging the parent substrate in a selective etch solution in order to dissolve the sacrificial layer, the pattern is transferred to the air/water-interface by means of the parent substrate. Subsequently the 3D host substrate is used to pick up the structures to be transferred, and if required the carbon film is etched to finalise the transfer. We illustrate this technique for a variety of nano- and micro-structures that can be applied in many different fields of research.
This work was conducted during my Post-doctoral studies at Chalmers University and was the result of a close collaboration between different research groups there.
The Chalmers University logo with a scale of 100 micrometer is transferred onto a commercial LED and projected it with 500 times magnification onto a wall using a microscope objective. The roughness of the LED surface is clearly visible in the microscope pictures and the projection.
Our latest paper entitled Highly conformal fabrication of nanopatterns on non-planar surfaces was published recently in Nanoscale. In this work lead by my former colleague Inès Massiot and in close collaboration with my current employer imec, we show the potential for applying colloidal lithography on highly non-planar substrates. We show how nanopatterning silicon substrates with micron-scale roughness results in an increase of the efficiency for photovoltaic cells with as much as 50%.
The PhotoNVoltaics project, part of the EU FP7-framework has ended now. The highlights of the project are discussed in the latest version of the IMEC magazine.
On a personal note, this was a very interesting project for me, as it allowed me to stay in touch with my former colleagues at imec during my 3 year stay at Chalmers University of Technology in Sweden. Thanks to everyone that made this such an enjoyable experience!
Our latest paper entitled Dimer-on-mirror SERS substrates with attogram sensitivity fabricated by colloidal lithography was published today in Nanoscale. In this work lead by Aron Hakonen we studied the performance of colloidal lithography based substrates for ultra sensitive SERS spectroscopy, reaching attogram concentrations. Next to conventional measurements in the lab, the substrates also proved to perform superb for in-field experiments using a handheld device.
Our latest paper just got accepted in Nano Letters and is entitled “Active magnetoplasmonic ruler“. This work was lead by Irina Zubritskaya and performed in collaboration with our partners in CIC NanoGUNE in Donostia-San Sebastian and the University of Gothenburg.
In this work, we show how magnetoplasmonic dimers can be exploited as very sensitive plasmonic rulers, which will self-align towards the most optimal configuration due to the application of an external magnetic field. This opens up opportunities for future applications in bio-sensing and localized drug delivery among many others.
I will be presenting our latest paper entitled Magnetoplasmonic design rules for active magneto-optics in the Photonics, Plasmonics and Magneto-Optics (PPM) conference at ImagineNano 2015 in Bilbao (March 10-12). The theoretical results from the paper will be illustrated with our latest measurements on 3D magnetoplasmonic nanoparticles.