Explanipedia

Penile mass with a past: Tertiary syphilis presenting as a penile gumma Open

Sharon Wang, Nolan J. Maloney, Herbert Ruckle, Martin R. Hofmann · 2025

A 46-year-old man presented with a rapidly growing, verrucous penile mass with bilateral inguinal lymphadenopathy, clinically consistent with locally advanced penile carcinoma. He had no history of sexually transmitted infections and negat…

High-Speed 1 THz Photonic Continuous Wave Phase-Sensitive Radar with Micrometer Precision Open

N. Schulz, Vladyslav Cherniak, Marcel Grzeslo, Lisa C. Kreuzer, Carsten Brenner , et al. · 2025

This paper presents a high-speed photonic continuous wave phase sensitive radar system operating at 1 THz with a measurement rate of 20 kHz and micrometer precision. The system utilizes a monolithic dual-mode distributed feedback laser wit…

VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers Open

N. N. Ledentsov, N. N. Ledentsov, V. A. Shchukin, Alexander N. Ledentsov, O. Makarov , et al. · 2025

Substantial improvements in the performance of optical interconnects based on multi-mode fibers are required to support emerging single-channel data transmission rates of 200 Gb/s and 400 Gb/s. Future optical components must combine very h…

IsoPSA density improves risk stratification and biopsy decision-making for clinically significant prostate cancer Open

Betty Wang, Tarik Benidir, Kristina Dortche, Jennifer Bullen, Zaeem Lone , et al. · 2025

IsoPSA density performed comparably to PSA density and outperformed traditional clinical predictors of csCaP. In MRI-negative men, its high negative predictive value supports its use as a non-invasive tool to reduce unnecessary biopsies. I…

Multimode vertical-cavity surface-emitting lasers under spin injection Open

Uliana Diiankova, Mariusz Drong, Tobias Pusch, Rainer Michalzik, Markus Lindemann , et al. · 2025

Recent research revealed that single-mode vertical-cavity surface-emitting lasers under spin injection (spin-VCSELs) have the potential to revolutionize laser technology for short-haul optical communications. While previous studies have fo…

CW Terahertz Spectroscopy of Heavy-Metal-Induced Alterations in Arabidopsis halleri Open

Lisa C. Kreuzer, Fabian Brix, Petra Düchting, Sebastian T. Gassel, N. Schulz , et al. · 2025

Soil pollution and the resulting accumulation of heavy metals in plants represent an increasing challenge for food safety and environmental monitoring. Traditional detection techniques are often destructive, labor-intensive, and poorly sui…

Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency Open

Markus Lindemann, Martino D’Alessandro, N. N. Ledentsov, O. Makarov, N. N. Ledentsov , et al. · 2025

Laterally coupled vertical-cavity surface-emitting lasers (VCSELs) can exhibit additional resonances at high modulation frequencies that can substantially increase the laser’s modulation bandwidth. State-of-the-art laterally coupled device…

Comparison of mode-locking performance in monolithic two-section InAs/InP quantum dot and InGaAsP/InP quantum well lasers Open

Navina Kleemann, Rejdi Gjoni, Nils Surkamp, Carsten Brenner, Philipp Scherer , et al. · 2025

A common method to generate ultrashort pulses in a two-section laser diode is to pump the large section with gain current and apply a reverse absorber voltage to the small section, which acts as a saturable absorber. Ultrashort pulses dete…

Dispersive Mirror-Based Phase Control in THz Homodyne Systems Open

Lisa C. Kreuzer, Nils Surkamp, N. Schulz, Valentin J. Wittwer, Martin Hoffmann , et al. · 2025

Coherent CW THz generation with a coupled‐cavity mini‐array VCSEL Open

Yinghui Hu, Carsten Brenner, N. N. Ledentsov, N. N. Ledentsov, V. A. Shchukin , et al. · 2025

Coupled‐cavity mini‐array vertical‐cavity surface‐emitting lasers (VCSELs) are promising laser sources for high‐speed data transmission due to their extended intensity modulation frequencies. Here, it is demonstrated for the first time how…

Diode Laser‐Based Generation of Mode‐Locked Pulses at 1067 Nm (290 fs, 69 W Peak Power) Open

Paul F. Haas, Nils Surkamp, Navina Kleemann, Heike Christopher, Andrea Knigge , et al. · 2025

We demonstrate the diode laser‐based generation of mode‐locked pulses with 290 fs temporal width and 69 W peak power at a centre wavelength of 1067 nm. The laser diode is operated in an external cavity configuration at a repetition rate of…

Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides Open

Leon Zens, Vira R. Besaga, Jens Möller, Nils C. Gerhardt, Martin R. Hofmann · 2024

We present a new methodology for measuring the gain and the linewidth enhancement factor of a semiconductor ridge-waveguide laser structure. The holographic methodology is based on a modified Mach-Zehnder interferometer. Compared with exis…

Self mode-locking and passive mode-locking in monolithic two-section InGaAsP/InP quantum well laser diode Open

Navina Kleemann, Rejdi Gjoni, Nils Surkamp, Carsten Brenner, Philipp Scherer , et al. · 2024

We analyze different mode-locking regimes of a monolithic two-section InGaAsP/InP quantum well mode-locked laser. By varying the electrical operation conditions, we investigate and compare the transition from self mode-locking via four wav…

Y-shaped tunable monolithic dual colour lasers for THz technology Open

Carsten Brenner, Nils Surkamp, Martin R. Hofmann · 2023

THz generation by difference frequency generation can be accomplished by many different laser systems. The most cost efficient and compact solution will be monolithic dual-colour lasers. Application of these lasers in THz metrology can suf…

Correction: Lay et al. Ultrasonic Quality Assurance at Magnesia Shotcrete Sealing Structures. Sensors 2022, 22, 8717 Open

Vera Lay, Ute Effner, Ernst Niederleithinger, Jennifer Arendt, Martin R. Hofmann , et al. · 2023

The authors wish to correct the following errors in the original paper [...]

Polarization dynamics in spin‐VCSELs with integrated surface grating for high birefringence splitting Open

Markus Lindemann, Natalie Jung, Nicolas Manrique‐Nieto, Tobias Pusch, Rainer Michalzik , et al. · 2023

Polarization dynamics in spin‐polarized vertical‐cavity surface‐emitting lasers (spin‐VCSELs) with high birefringence have recently been demonstrated to offer very high potential for optical data‐transmission systems that outperform their …

Terahertz Sources and Receivers: From the Past to the Future Open

Sumer Makhlouf, Oleg Cojocari, Martin R. Hofmann, Tadao Nagatsuma, Sascha Preu , et al. · 2023

The rapid progress in semiconductor technology has vastly boosted the development of terahertz sources and receivers in terms of compactness, reliability, operation frequency, and output power. In this manuscript, we report on the latest a…

Accurate OCT-based diffuse adult-type glioma WHO grade 4 tissue classification using comprehensible texture feature analysis Open

Jens P. Möller, Eveline Popanda, Nuri H. Aydın, Hubert Welp, Iris Tischoff , et al. · 2023

Maximum safe resection of diffuse adult-type glioma WHO grade 4 (glioma °4) is a well-established procedure in order to prolong a patient's lifetime. However, differentiation between glioma and healthy brain tissue remains a challenge in a…

Terahertz Sources and Receivers: From the past to the Future Open

Sumer Makhlouf, Oleg Cojocari, Martin R. Hofmann, Tadao Nagatsuma, Sascha Preu , et al. · 2023

The paper gives an overview of Semiconductor-based THz sources and receivers.

Terahertz Sources and Receivers: From the past to the Future Open

Sumer Makhlouf, Oleg Cojocari, Martin R. Hofmann, Tadao Nagatsuma, Sascha Preu , et al. · 2023

The paper gives an overview of Semiconductor-based THz sources and receivers.

Figure S3 from The Immune Checkpoint Modulator OX40 and Its Ligand OX40L in NK-Cell Immunosurveillance and Acute Myeloid Leukemia Open