FBH research: 19.10.2020

FBH’s high-performance FET-based THz detectors reach user level

Based on its GaN HEMT MMIC process, the FBH develops state-of-the-art TeraFETs. They work at room temperature with excellent sensitivity, comparable to classical diode-based performance. The THz frequency range is attractive for various applications in biology, medicine and industry.

FBH research: 06.10.2020

The floating-ground transistor – a key enabler for reverse-type envelope tracking systems for space applications and 5G

The packaged floating-ground RF power GaN-HEMT is a novel patented invention developed by FBH. It allows straightforward floating-ground RF PA designs, but also opens a whole new field of GaN based circuits that benefit from reverse operation.

FBH research: 22.09.2020

Milliwatt power 233 nm far-UVC LEDs on sapphire substrates

Far-UVC LEDs are attractive for applications like monitoring of gas concentrations and measurement of nitrite in water. FBH and TU Berlin have developed 233 nm AlGaN-based far-UVC LEDs with previously unattained emission power and lifetime – based on comprehensive optimizations within the LED fabrication chain.

FBH research: 9.9.2020

D-band up-converter with gain peak conversion of 17 dB using extremely scaled InP DHBT epitaxy

FBH has successfully realized a D-band up-converter (between 110 and 170 GHz). The MMIC was manufactured on the in-house InP DHBT transfer-substrate process with feature sizes down to 250 nm. The up-converter achieved 17 dB peak conversion gain with DC power consumption as low as 25 mW.

FBH research: 27.08.2020

Enhancing Modeling Accuracy - Simulating Drain Lag of GaN HEMTs with ASM-HEMT

The FBH developed with BTU Cottbus-Senftenberg a compact model to bridge the gap between experiment and modeling of semiconductor devices. Therefore, the ASM-HEMT physics-based compact model has been enhanced with a drain-lag implementation.

FBH research: 12.08.2020

Hybrid atom traps for high-sensitivity quantum sensors in compact volumes

Atomic quantum sensors enable the measurement of e.g. accelerations or external fields with unprecedented precision. FBH works on miniaturized optical setups to further integrate atom-chip based sensors combined with conceptual studies on the cold atom preparation in hybrid traps.

FBH research: 31.07.2020

600 W short-pulse hybrid-integrated 48-emitter DBR laser module for 3D flash LiDAR

The multi-emitter source is ideally suited for autonomous driving, generating high peak power and pulses in the nanosecond range. Short pulses guarantee both high spatial resolution and eye safety.

FBH research: 21.07.2020

Approaches for higher power in GaAs-based broad area diode lasers

High-power diode lasers based on GaAs are the most efficient light sources for converting electrical input to optical power. For making them even more efficient, FBH continued its work to understand and overcome power limiting factors.

FBH research: 03.07.2020

Low power in mind: electrical and structural improvements of the Pd/p-GaN interface

To reduce power consumption of optoelectronic devices FBH conducts researches to lower contact resistance between the contact and the semiconductor material. Focus is the contact system at the Pd/gallium nitride (GaN) interface.

FBH research: 15.06.2020

Compact micro-integrated laser modules for the next generation of optical clocks

FBH has realized a compact micro-integrated laser module for a transportable, robust, and user-friendly optical clock to be operated outside specialized labs. The clock itself is based on the ²S_1/2-²D_3/2 transition of a single ¹⁷¹Yb⁺ ion at 436 nm.

FBH research: 28.05.2020

µPQ – ultra-compact microwave plasma source for atmospheric pressure

FBH has developed an ultra-compact microwave plasma source for atmospheric pressure. It delivers a potential-free microwave plasma with a plasma power in the 15 to 20 W range, which is sufficient for many applications.

FBH research: 06.05.2020

Extended lifetime for DBR tapered diode lasers due to a novel internal output DBR-grating

To treat eye diseases, laser coagulation with laser emission at 532 nm is widely used. For this purpose, FBH is developing high reliable, high spectral radiance laser sources emitting at 1064 nm for second harmonic generation, thus halving the wavelength.

FBH research: 16.04.2020

Raman spectroscopic investigations on soil using a 785 nm dual-wavelength diode laser

Precision agriculture is becoming increasingly important. The FBH evaluates the potential of Raman spectroscopy. The non-destructive optical method can be used to characterize soil, thus paving the way for efficient nutrient management.

FBH research: 30.03.2020

Optimized buried Bragg gratings for high-power DFB-BA lasers

High-power, highly efficient broad area diode lasers that are wavelength-stabilized by integrated Bragg gratings are in high demand for example for pumping narrow absorption bands in solid-state lasers. FBH has been conducting intensive research leading to continuous improvements of the institute’s DFB-BA lasers.

FBH research: 10.03.2020

Digitization in cleanrooms – iSensU connects legacy tools to modern processing equipment

To make older systems ready for digitization, FBH has been developing iSensU to provide ad-hoc connectivity to legacy devices, black-box sensors, and industrial light towers. iSensU will shortly be made available to FBH's partner institutes within Research Fab Microelectronics Germany.

FBH research: 17.02.2020

Improved thermal management of InP high-power transistors

InP HBT technology is an ideal candidate for microwave applications in the terahertz range. The FBH uses a transfer substrate process to successfully suppress significant parasitic effects. For further improvements, an in-house diamond wafer bonding process was developed to enhance the thermal management of the wafer.

FBH research: 30.01.2020

GaN digital outphasing power amplifier – targeting efficient 5G communications

The next-generation wireless communication infrastructure demands for high flexibility, low cost and high efficiency. The FBH has developed a digital outphasing power amplifier module, an important step towards the all-digital transmitter chain.

FBH research: 13.01.2020

Higher efficiency and narrower far field in kilowatt-class diode laser bars

FBH demonstrates new performance records of diode laser bars at the operation point of 1 kW. One design approach increased the conversion efficiency up to 66%, while an alternative approach reduced the lateral divergence down to 8.8°, both best-in-class results.

FBH research: 06.01.2020

Simulation and design of compact tunable dual-wavelength diode laser systems

The FBH presents a new, compact and monolithically integrated tunable dual-wavelength laser design based on gallium arsenide. The device parameters were optimized by means of sophisticated simulation tools.

Ferdinand-Braun-Institut

Research News 2020