A5078103911- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Terahertz technology and applications
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Radio Frequency Integrated Circuit Design
- Millimeter-Wave Propagation and Modeling
- Microwave Engineering and Waveguides
- Diamond and Carbon-based Materials Research
- Semiconductor Lasers and Optical Devices
- Spectroscopy and Laser Applications
- Molecular Communication and Nanonetworks
- Ga2O3 and related materials
- Atmospheric Ozone and Climate
- Digital Marketing and Social Media
- Advanced Power Amplifier Design
Karlsruhe Institute of Technology
2014-2023
Université d'Angers
2019
College Track
2019
Silicon photonics offers tremendous potential for inexpensive high-yield photonic-electronic integration. Besides conventional dielectric waveguides, plasmonic structures can also be efficiently realized on the silicon photonic platform, reducing device footprint by more than an order of magnitude. However, neither nor metals exhibit appreciable second-order optical nonlinearities, thereby making efficient electro-optic modulators challenging to realize. These deficiencies overcome concepts...
Electro-optic (EO) modulators rely on the interaction of optical and electrical signals with second-order nonlinear media. For signal, this can be strongly enhanced using dielectric slot–waveguide structures that exploit a field discontinuity at interface between high-index waveguide core low-index EO cladding. In contrast to this, signal is usually applied through conductive regions in direct vicinity waveguide. To avoid excessive loss, conductivity these maintained moderate level, thus...
Diamond provides superior optical and mechanical material properties, making it a prime candidate for the realization of integrated optomechanical circuits. Because diamond sub- strates have matured in size, efficient nanostructuring methods can be used to realize full-scale devices. Here we review resonators fab- ricated from polycrystalline as well single crystalline diamond. We present relevant properties with respect implementing devices compare them other systems. give an overview...
Photonics might play a key role in future wireless communication systems that operate at THz carrier frequencies.A prime example is the generation of data streams by mixing optical signals high-speed photodetectors.Over previous years, this concept has enabled series transmission experiments record-high rates.Reception these experiments, however, still relied on electronic circuits.In paper, we show receivers can also greatly benefit from optoelectronic signal processing techniques,...
We demonstrate wireless transmission of QPSK signals at a carrier frequency 0.3 THz using generalized Kramers-Kronig receiver with Schottky barrier diode. achieve line rate 100 Gbit/s over distance 110 m.
Diamond integrated photonic devices are promising candidates for emerging applications in nanophotonics and quantum optics. Here we demonstrate active modulation of diamond nanophotonic circuits by exploiting mechanical degrees freedom free-standing electro-optomechanical resonators. We obtain high quality factors up to 9600, allowing us read out the driven nanomechanical response with optical interferometers sensitivity. able excite higher order modes 115 MHz observe also under ambient conditions.
We demonstrate the first silicon-plasmonic photomixer. THz radiation is generated and received by employing two lasers near 1.5 µm. The receiver sensitivity of 28 mA/(W V) compares well with a commercial system.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text S. Ummethala, T. Harter, K. Köhnle, Muehlbrandt, Y. Kutuvantavida, J. N. Kemal, Schaefer, H. Massler, A. Tessmann, Garlapati, Bacher, L. Hahn, M. Walther, Zwick, Randel, W. Freude, and C. Koos, "Terahertz-to-Optical Conversion Using a Plasmonic Modulator," in Conference Lasers Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2018), paper STu3D.4....
We report a THz wireless link at 0.2885 which is embedded in photonic network. An ultra-broadBand plasmonic modulator directly converts the signal to optical domain. transmit QPSK data with line rates up 50 Gbit/s.
Radiation pressure forces provide new mechanical degrees of freedom to free-standing optical components. In particular in the case nanophotonic systems such enable efficient light-based actuation for tunable devices and superior sensing elements within framework optomechanics. The quest design optimal optomechanical structures applications fundamental physics metrology relies on novel materials with both excellent properties. These requirements make diamond an choice realization advanced...
Silicon-plasmonic internal photoemission devices can act as photomixers for generating terahertz frequency carriers (T-waves) transmitters (Tx), or they function receivers (Rx) coherently downconverting T-wave signals to the baseband. In a first demonstration, we monolithically integrate Tx and Rx on silicon chip operate them in carrier range up 1THz . With co-integrated transmission line both components be connected.
We demonstrate horizontal-slot plasmonic-organic hybrid (HS-POH) modulators and show that the n-voltage-loss product aUL is by 25 % better than for conventional vertical-slot devices. The slot realized a sacrificial layer, thereby relaxing extreme lithography-resolution requirements.
Plasmonic internal photoemission detectors (PIPED) have recently been shown to combine compact footprint and high bandwidth with monolithic co-integration into silicon photonic circuits, thereby opening an attractive route towards optoelectronic generation detection of waveforms in the sub-THz THz frequency range, so-called T-waves. In this paper, we further expand PIPED concept by introducing a metal-oxide-semiconductor (MOS) interface additional gate electrode that allows control carrier...
High-speed electro-optic (EO) modulators are key devices for optical communications, microwave photonics, and broadband signal processing. Among the different material platforms high-density photonic integrated circuits (PIC), silicon photonics sticks out because of CMOS foundries specialized in PIC fabrication. However, absence Pockels effect renders EO with high-efficiency large modulation bandwidth difficult. In this dissertation, plasmonic slot waveguide investigated. The built on...
Microring resonators are one of the most sought-after optical components for realizing several on-chip functionalities that include sensing, data routing, new frequency generation, and quantum photonic applications. Many these applications demand a high quality factor large notch depth (high extinction ratio), which can be achieved by critical coupling. However, coupling is very sensitive to fabrication accuracies thermal drift. Geometrical parameters generally swept attain coupling, where...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text P. Rath, S. Ummethala, Diewald, G. Lewes-Malandrakis, D. Brink, N. Heidrich, C. Nebel, and W. H. Pernice, "Diamond electro-optomechanical devices resonance frequencies above 100 MHz," in CLEO: 2015, OSA Technical Digest (online) (Optica Publishing Group, 2015), paper STh3I.1. Export BibTex Endnote (RIS) HTML Plain alert Save article
Diamond integrated photonic devices are promising candidates for applications in nanophotonics and optomechanics. Here I present active modulation of diamond-based by exploiting mechanical degrees freedom free-standing electro-optomechanical resonators.