Polarization control of THz light is paramount interest for the numerous applications offered in this frequency range. Recent developments spintronic emitters allow a very efficient broadband emission, and especially unique their ability polarization switching through magnetization ferromagnetic layer. Here we present an improved scheme to achieve full 360° nearly coherent rotation that does not require multipolar or rotating external magnetic bias nor complex cascaded emitters. By replacing...

Spintronic terahertz emitters promise sources with an unmatched broad frequency bandwidth that are easy to fabricate and operate, therefore scale at low cost. However, current experiments proofs of concept rely on free-space ultrafast pump lasers rather complex benchtop setups. This contrasts the requirements widespread industrial applications, where robust, compact, safe designs needed. To meet these requirements, we present a novel fiber-tip spintronic emitter solution allows systems be...

Spintronic terahertz emitters (STEs), based on optical excitation of nanometer thick ferromagnetic/heavy metal (FM/HM) heterojunctions, have become important sources for the generation (THz) pulses. However, efficiency optical-to-THz conversion remains limited. Although techniques been developed to enhance absorption, no investigations studied application THz cavities. Here, STEs in a selected spectral range, FM/HM structures are realized ultra-thin sapphire layers with metallic mirrors create

THz polarization control upon generation is a crucially missing functionality. spintronic emitters based on the inverse spin Hall effect allow for this by strict implicit orthogonality between their magnetization state and emitted polarization. This was up till now only demonstrated using cumbersome external magnetic field biasing to impose direction. We present here first time an efficient voltage of terahertz emitters. Using ferromagnetic pumping multilayer exhibiting simultaneously strong...

Spintronic rf detectors are efficient nanoscale counterparts to conventional semiconductor-based components for energy harvesting and wireless communication at low input power. Here, we report on the optimization of rectified output dc voltage using magnetic tunnel junctions (MTJs) with strong perpendicular anisotropy both polarizing free layers. The magnetization layer is fixed out-of-plane, while thickness adjusted so that its orientation changes from in-plane out-of-plane. Rectification...

We demonstrate an efficient and simple modulation of the polarization in Spin-tronic Terahertz Emitters, by rapid switching magnetization using high-frequency magnetic field, enhanced field induced Spin Reorientation Transition (SRT). The instability layer at transition allows for a higher sensitivity magne-tization lower power frequencies up to 100kHz.

Spintronic Terahertz Emitters (STE) represent a significant advancement in source technology, exploiting the ultrafast demagnetization process of spin-electrons to unveil 30THz wide, gapless spectrum, accessible through femtosecond lasers across full VIS-IR range. This innovation not only positions STEs as pivotal THz technology but also underscores their role cost-effective, high-performance solution, thereby redefining standards within field. However, inherent spintronic nature these...

Optically pumped spintronic terahertz emitters (STEs) have, in less than a decade, strongly impacted (THz) source technology, by the combination of their Fourier‐limited ultrafast response, phononless emission spectrum and wavelength‐independent operation. However, intrinsic strength inverse spin Hall effect governing these devices introduces challenge: optical‐to‐terahertz conversion efficiency is considerably lower traditional sources. It therefore primordial to maximize at least...

Spintronic Terahertz Emitters In article number 2400064, Mathias Vanwolleghem and co-workers experimentally demonstrate a close to 100-fold improvement of the power efficiency inverse spin Hall emitters by maximizing impact electromagnetic environment nanometric emitter. As result, moving from basic emitter on bare substrate one functionalized resonant crystal cavity an impedance matched emitting substrate, emitted THz field pulses can reach several MV/cm peak strengths without any echo behavior.

We have demonstrated experimentally how ultrabroadband inverse spin Hall emitters present an unprecedented new scheme for room temperature THz CW and frequency comb generation. Building on previous proof-of-principle demonstrations, we demonstrate here by improved experimental developments this photomixing effectively does not any rolloff at least up to 1,05THz, contrary standard photoswitches. A theoretical numerical model implementing dynamics in nanometric FM/HM stacks predict bandwidths 10THz.

Spintronic terahertz emitters (STEs) are gapless, ultrabroadband sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs by strong pump lasers operating at kilohertz repetition rates excel in generating high electric field strengths for spectroscopy or ellipsometry, newly advancing technologies such as ultrafast modulation of polarization, scanning tunneling microscopy, laser emission nanoscopy, fully fiber-coupled integrated systems demand an STE...

Spintronic terahertz emitters (STEs) are gapless, ultrabroadband sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs by strong pump lasers operating at kilohertz repetition rates excel in generating high electric field strengths for spectroscopy or ellipsometry, newly advancing technologies such as ultrafast modulation of polarization, scanning tunneling microscopy, laser emission nanoscopy, fully fiber-coupled integrated systems demand an STE...

Spintronic terahertz emitters (STEs) are gapless, ultrabroadband sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs by strong pump lasers operating at kilohertz repetition rates excel in generating high electric field strengths for spectroscopy or ellipsometry, newly advancing technologies such as ultrafast modulation of polarization, scanning tunneling microscopy, laser emission nanoscopy, fully fiber-coupled integrated systems demand an STE...

Spintronic terahertz emitters (STEs) are gapless, ultrabroadband sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs by strong pump lasers operating at kilohertz repetition rates excel in generating high electric field strengths for spectroscopy or ellipsometry, newly advancing technologies such as ultrafast modulation of polarization, scanning tunneling microscopy, laser emission nanoscopy, fully fiber-coupled integrated systems demand an STE...

Spintronic terahertz emitters have attracted considerable interest within the last decade. They promise sources with unmatched broad frequency bandwidth which are easy to manufacture and operate, therefore scale at low cost. However, experiments proofs of concept rely on free-space ultrashort-pulsed pump lasers rather complex benchtop setups. This contrasts requirements widespread industrial applications, where robust, compact, safe footprints needed. To meet these requirements, we present a...

We demonstrate an efficient v oltage c ontrol o f t he p olarization i n Spintronic Terahertz Emitters, by combining a spin pumping multilayer with strong magnetic anisotropy and magnetoelastic properties, piezoelectric substrate to obtain reversible 70° THz polarization rotation sweeping the applied voltage on over 400V.

Spintronic terahertz emitters promise sources with an unmatched broad frequency bandwidth that are easy to fabricate and operate, therefore scale at low cost. However, current experiments proofs of concept rely on free-space ultrafast pump lasers rather complex benchtop setups. This contrasts the requirements widespread industrial applications, where robust, compact, safe designs needed. To meet these requirements, we present a novel fiber-tip spintronic emitter solution allows systems be...

The boom in terahertz technologies of the last few decades is now not limited to use electric charge, but also fully exploits spin. Revolutionary spintronic emitters (STEs) offer versatile usage under a wide range visible and infrared excitation wavelengths, arbitrary reflection/transmission geometries, utilization with most femtosecond oscillators amplifiers. STE emission results 30THz-broad gapless spectrum easily controllable polarization. However, optical-to-terahertz conversion...

Recently, the terahertz family of sources increased by newly-developed spintronic emitter (STE), which competes with traditional in many ways. This 30THz-broadband gapless source is versatile due to its low-cost, easy implementation, frequency-independent excitation, and perpendicularly-given polarization STE's magnetization. Nowadays, control STEs was demonstrated rotating multipolar magnets, a twisted magnetic field, or cascades STEs. The methods suffer from mechanical stability,...

Spintronic terahertz emitters are new to the source family. They broad-spectrum and gapless unlike traditional sources involving semiconductors nonlinear crystals. Moreover, they can emit intense electromagnetic fields strong enough for application, but on other hand, operate with low excitation pulse energy, which makes them quite versatile sources. Unfortunately, spintronic suffer from conversion efficiency. In this work, we present a emission enhancement by integrating emitter designed...

We demonstrate for the first time a novel THz photomixing paradigm exploiting ultrabroadband inverse spin Hall emitters. Both narrow band $(\sim 20$ Hz) CW emission by beating of two stabilized IR DFB lasers on Pt/CoFeB/W stack is obtained as well successful spintronic downconversion frequency comb to with 1GHz spacing.