frequent 06-2014
frequent 06_2014 - terahertz electronics (pdf)


Effizienter in Kontakt bleiben

Press release: 12.05.2015 (in German)

Funkantennen für die mobile Kommunikation gibt es reichlich. Bei zu vielen Nutzern gleichzeitig am gleichen Ort ist eine Antenne allerdings schnell überlastet. Das liegt in der Regel an den Verstärkern, welche die Informationen noch analog verarbeiten müssen. Im FBH-Projekt "Digitale Leistungsverstärker" werden nun kleinere, flexiblere und kompaktere Module für Verstärker entwickelt.
more... (only in German)

Schnell und effizient schalten – dank HiPoSwitch

Source: Maschinenmarkt, 27.04.2015 (in German)

Im EU-Verbundprojekt Hi Po Switch ist es gelungen, effiziente und blitzschnelle Galliumnitrid-Leistungsschalter zu entwickeln. Sie sind die Basis für energiesparende, kompakte und leichte Leistungskonverter, die elektrische Energie nutzbar machen. Das Marktpotenzial ist riesig, da solche Wandler in beinahe jedem Gerät sitzen.
more... (only in German)

German researchers make semiconductor laser to test relativity

Source: Compund Semiconductor, 23.04.2015

The Ferdinand-Braun-Institut (FBH) in Berlin, Germany, has developed an ultra-precise, compact semiconductor laser  for measuring relativity in space. On April 23, the micro-integrated Extended Cavity Diode Laser (ECDL) was used for tests on board the German Aerospace Centre (DLR)-funded FOKUS research rocket. The aim of FOKUS is to see whether clocks run differently under space conditions like Einstein claimed by sending various types of clocks into space and back again.

DFB laser module designed to test subtleties of General Relativity

Source: Laser Focus World, 23.04.2015

Researchers at Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH; Berlin, Germany) have designed and constructed a microintegrated semiconductor-laser module that is part of an atomic clock specifically designed to test the subtleties of Einstein's General Relativity theory.

Girls' Day at FBH

FBH news: 23.04.2015

GirlsDay 2015 014 r k 01

Today the FBH opened its doors for the Girls'Day. The girls learned from the institute's trainees and junior researchers about their world of employment and gained information about FBH's tiny, powerful lasers. For more information please switch to the German website.

Examining Einstein – precise experiments using lasers in space

Press release: 23.04.2015

Albert Einstein tells us that clocks run slower the deeper they are in the gravitational potential well of a mass – the closer they are to a heavenly body, for example. This effect is described by General Relativity Theory as the gravitational red shift – it is detectable in spectral lines that shift toward the red end of the spectrum. General Relativity Theory also predicts that the rates of all clocks are equally influenced by gravitation independent of how these clocks are physically or technically constructed. However, more recent theories of gravitation allow for the possibility that the type of clock indeed influences the degree of gravitational red shift.

Photonics and Optoelectronics Network PHOENIX

Source: Optik & Photonik, 2/2015

First collaborative projects with FBH contribution initiated with Berlin grants: violet-emitting laser systems in collaborative project "BriVi" and fast, intrinsic vertical GaN switching transistors for directly controlling diode lasers (PioneerGaN).

HiPoSwitch Project Develops High-Efficiency, Lightning-Fast Gallium Nitride Power Switches

Source: AZO Materials, 17.04.2015

The project is led by the Ferdinand-Braun-Institut, Leibniz-Institut für Hoechstfrequenztechnik in Berlin, in collaboration with eight industrial and research partners from across central Europe. Lightning-fast power switches are needed to make power convertors which are compact, light-weight and energy-efficient. These converters are widely used in many electronic devices, so any new design which offers effiency benefits will have a huge market potential.

HiPoSwitch project completed with development of fast, efficient normally-off GaN-on-Si power transistors

Source: Semiconductor Today, 15.04.2015

Lasting from September 2011 to end-August 2014 with a budget of €5.57m (including €3.58m of funding from the European Union), the recently completed three-year project HiPoSwitch ('High Power Switch') has developed prototype fast, high-efficiency power switches using gallium nitride (GaN) operating in enhancement-mode. Such transistors are essential for producing energy-efficient, compact and light-weight power converters that make electrical energy more usable. The market potential is reckoned to be enormous, since these converters are found in nearly every electronic device.

EU-Projekt HiPoSwitch für GaN-Komponenten

Source: Channel-E, 15.04.2015 (in German)

In dem vom Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) geleiteten Projekt haben acht europäische Partner aus Forschung und Industrie selbstsperrende Galliumnitrid (GaN)-Leistungstransistoren bis zum Prototypen entwickelt.
more... (only in German)

Fast, efficient switching – thanks to HiPoSwitch

Source:, 15.04.2015

Electrical power comes out of wall sockets, of course. But hardly any electronic device can take normal line voltage. Computers, smartphones, LEDs, and chargers, for instance, cannot use electrical energy in that form – the line voltage must be converted from AC to DC. The reverse conversion (DC to AC) is also commonly used, such as in solar panel inverters. Power converters use power transistor switches as key components to accomplish this. Lightning-fast semiconductor switches able to operate these kinds of converters more efficiently have now been developed in the recently completed EU group project called HiPoSwitch.

Fast, efficient switching – thanks to HiPoSwitch

Press release: 15.04.2015

HiPoSwitch, an EU group-project led by the FBH, has successfully developed lightning-fast, high-efficiency gallium nitride power switches. These are essential for producing energy-efficient, compact, and light-weight power converters that make electrical energy more useable. The market potential is enormous, since these converters are found in nearly every electronic device.

Demonstration of GaN-based near UV laser diodes

Source: Laser Technik Journal, April 2015

The Fedinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) has developed low-threshold gallium nitride (GaN) based edge-emitting laser diodes (LDs) emitting in the near ultraviolet spectral range. Based on previous developments of blue-violet InGaN quantum well LDs operating in cw mode, we were able to realize laser structures emitting below 390 nm with threshold current densities as low as 2 kA/cm² in pulsed operation.

Adlershof: Die kleine Stadt der Super-Hirne

Source: B.Z. 02.04.2015 (in German)

Adlershof ist Berlins Hightech-Standort. Hier arbeiten 16000 hochqualifizierte Menschen. B.Z. stellt sechs Produkte zum Staunen vor.

Jetzt wird aus Adlershof Silicon Valley

Source: Bild 02.04.2015 (in German)

Die Pampa, wie Adlershof in den 90er-Jahren noch spöttisch genannt wurde, boomt. Inzwischen arbeiten rund 16 000 Menschen an Berlins Hightech-Standort...

Top score - FBH positively evaluated and recommended for further funding

FBH news: 24.03.2015

In its meeting on March 23, 2015, the Senate of the Leibniz Association recommended the Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) for further joint funding by the federal and state authorities. This represents the successful completion of the current evaluation process at FBH, conducted by international experts every seven years, which is obligatory for each Leibniz institute.

Günther Tränkle, Director of the FBH, was very pleased about the extraordinary positive rating, according to which the institute belongs to the internationally most renowned competence centers in the field of III-V semiconductor technology. The report acknowledges that the institute has impressively enhanced the already very high performance level. FBH’s work in the field of III-V semiconductor technology is considered to yield excellent and internationally competitive state-of-the-art results with applications and technology transfer of high scientific, social, and economic relevance. "This report positively confirms our concept and our results", explains Günther Tränkle, "and encourages us to further pursue and even expand our ambitions resulting in excellent research and comprehensive transfer activities."

more... (press release, Leibniz Association - in German)

Building brighter, more powerful lasers diodes

Source: Compound Semiconductor, March 2015, p. 30 ff.

(...) Reducing the number of lateral modes has also held the key to the high performance of lasers fabricated by scientists from the Ferdinand Braun Institute in Berlin. By combining advanced epitaxial designs with facet passivation and 30 µm-wide stripes that cut off higher order lateral modes, the team could produce diodes delivering more than 7 W at an efficiency in excess of 50 percent, while realising a beam parameter product of around 1.5 mm-mrad. (...)
more... (pdf, FBH from p. 33)

Placed first in "Most Downloaded Journal of Crystal Growth Articles"

Source: Elsevier Journals, 18.02.2015

A recently published joint paper of FBH, Hochschule Ruhr West, and Laytec currently ranks on the first place among the articles in Journal of Crystal Growth most downloaded in the last 90 days. The paper reports the first in-situ photoluminescence study of growing InGaN LED structures inside an industrial-grade MOVPE reactor. It reveals that the emission wavelength of LEDs can already been determined and if necessary adjusted during growth.
... overview
... paper

Prof. Dr.-Ing. Wolfgang Heinrich re-elected as President of the European Microwave Association

FBH news: 16.02.2015

At the turn of the year, Wolfgang Heinrich, FBH's long-term Microwaves Department Head and Professor at the Technische Universität Berlin, took over the presidency of the European Microwave Association (EuMA) for another three-year term. He is already holding this function since 2010.

EuMA has members from all over Europe and adjacent nations. It is one of the internationally most important associations for scientists and engineers within the microwave field. The non-profit organization which is based in Belgium both encourages cooperation within the technology field and promotes microwave activities in Europe by means of education and training. It holds the annual European Microwave Week which comprises three conferences and an exhibition - apart from the International Microwave Week in the United States, this event is the most important microwaves conference world-wide with about 1,500 conference participants and typically 4,000 visitors.

Schwereloses Interferometer

Source: Pro Physik , 04.02.2015 (in German)

Die Gültigkeit des Äquivalenzprinzips auf atomarer Ebene zu überprüfen ist Ziel des Gemeinschaftsprojektes QUANTUS III, an dem die Universitäten Hannover, Hamburg, Ulm, Mainz, Darmstadt, Bremen und die HU-Berlin sowie das FBH beteiligt sind.

Berliner Forscher überprüfen Einstein

Source: Berliner Zeitung, 03.02.2015 (in German)

Sie wollen im Weltall testen, ob Atome verschiedener Stoffe im Vakuum wirklich gleich schnell fallen.
(in German, article not online)

Wie allgemein ist die Allgemeine Relativitätstheoriee

Press release: 30.01.2015 (in German)

"Auf der Größenskala von Galaxien erklären die Gesetze der Gravitation nicht, warum sich das Universum so entwickelt hat, wie wir es kennen“, sagt Andreas Wicht, Leiter der Arbeitsgruppe Lasermetrologie am Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH). „Und für die mikroskopische Ebene, unterhalb von hundert Mikrometern, gibt es gar keine experimentelle Überprüfung der Gültigkeit des Gravitationsgesetzes, so wie wir es kennen."
more... (only in German, related image available)

Stark und effizient

Source: Pro Physik, 23.01.2015 (in German)

Diodengepumpte Festkörperlaser, die hohe Impulsenergien im Joule-Bereich bei mittleren Leistungen von mehreren hundert Watt liefern, waren bislang weltweit nicht verfügbar. Sie werden jedoch für Hochfeldlasersysteme, die auf leistungsstarken Ultrakurzpuls-Lasern basieren, dringend benötigt.
more... (only in German)

Knighthood for Scientific Board Member Frank van den Bogaart

FBH news: 21.01.2015

The FBH congratulates its long-term member of the Scientific Board Frank van den Bogaart. Dr. van den Bogaart was knighted in the Order of Oranje-Nassau by the Dutsch King Willem-Alexander in September 2014. He received his royal honor for his achievements in the field of radar technology with particular focus on microwave monolithic integrated circuits (MMICs).

Effizient und robust: Hochleistungs-Pumplasermodul mit Faserkopplung

Press release FBH/C2GO: 19.01.2015 (in German)

Das innovative Modul mit 6 kW Lichtleistung basiert auf besonders effizienten, leistungsstarken 940 nm QCW-Diodenlasern aus dem Ferdinand-Braun-Institut und einem von C2GO inprocess solutions entwickelten wassergekühlten Trägermodul, das eine neuartige, sehr effiziente Montage ermöglicht.
more... (only in German)

FBH uses LayTec's EpiCurve in-situ metrology to eliminate SiC/GaN wafer cracking in ICP etching

Source: 16.01.2015

In-situ metrology system maker LayTec AG of Berlin, Germany says that researchers at Berlin-based Ferdinand-Braun-Institut für Höchstfrequenztechnik (FBH) have applied EpiCurve in-situ metrology for optimizing etching recipes in a Sentech SI 500 inductively coupled plasma reactive-ion etch (ICP-RIE) tool.
more... (in Englisch)

Best of Berlin + Brandenburg

Source: Adlershof Journal, 01/2015 (in German)

Er [Kirstaedter, Lumics GmbH] geht davon aus,  dass Diodenlaser aus Adlershof einige etablierte Lasertechnologien in den Hintergrund drängen werden. "Ohne die tollen Kooperationsmöglichkeiten hier am Standort, insbesondere mit dem Ferdinand-Braun-Institut (FBH), wäre diese Entwicklung wohl kaum möglich gewesen", lobt Kirstaedter.
more... (in German)

Adlershof: Experimentierfeld für Lichtgestalten

Source: Adlershof Journal, 15.01.2015 (in German)

Schon seit den 1960er-Jahren heben Forscher und Entwickler in Adlershof technologische und wirtschaftliche Potenziale des Lichts. Aktuell treiben über ein halbes Dutzend universitärer und außeruniversitärer Institute optische und photonische Forschung voran.
more... (in German)