Magnetization rotation-based polarization control of spintronic terahertz emitter

Pierre Koleják; Geoffrey Lezier; Kamil Postava; Jean-François Lampin; Nicolas Tiercelin; Mathias Vanwolleghem

doi:10.1117/12.2663659

12 December 2022 Magnetization rotation-based polarization control of spintronic terahertz emitter

Pierre Koleják, Geoffrey Lezier, Kamil Postava, Jean-François Lampin, Nicolas Tiercelin, Mathias Vanwolleghem

Proceedings Volume 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 1250209 (2022) https://doi.org/10.1117/12.2663659
Event: 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2022, Wojanow, Poland

Abstract

Recently, the terahertz family of sources increased by newly-developed terahertz spintronic emitter (STE), which competes with the 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 to the STE’s magnetization. Nowadays, the polarization control of STEs was demonstrated by rotating and multipolar magnets, a twisted magnetic field, or cascades of STEs. The methods suffer from mechanical stability, realization difficulties, and limited polarization control. We introduce here our new approach to control the emitted polarization following Stoner-Wohlfarth magnetization rotation within our FeCo/TbCo₂/FeCo-based STE exploiting magnetic anisotropy. The varying magnetic field along the hard magnetic axis induces the magnetization rotation, performing the polarization control. We present full-360-degree linear polarization control, not needing mechanically rotating components. This technique guarantees higher stability for polarimetry applications. We prove the whole terahertz spectrum follows the polarization control, preserving even the phase of sub-picosecond terahertz emission. It offers easy polarization calibration of the emitter for terahertz experimental setups. Moreover, we provide models to explain magnetic hysteresis defining the polarization behaviour. We predict that the polarization-controlled STEs will find many applications covering terahertz time-domain polarimetry and ellipsometry, medical imaging and security detection.

Citation Download Citation

Pierre Koleják, Geoffrey Lezier, Kamil Postava, Jean-François Lampin, Nicolas Tiercelin, and Mathias Vanwolleghem "Magnetization rotation-based polarization control of spintronic terahertz emitter", Proc. SPIE 12502, 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 1250209 (12 December 2022); https://doi.org/10.1117/12.2663659

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
5 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Polarization

Magnetism

Polarization control

Spintronics

Terahertz radiation

Anisotropy

Polarimetry

Show All Keywords

Keywords/Phrases

Search In:

Publication Years