MOUNAIX, Patrick; LASCOUX, Noëlle; DEGERT, Jérôme; FREYSZ, Eric; KOBAYASHI, A.; DARO, Nathalie; LÉTARD, Jean-François

doi:10.1063/1.2143123

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MOUNAIX, Patrick
Centre de physique moléculaire optique et hertzienne [CPMOH]

LASCOUX, Noëlle
Centre de physique moléculaire optique et hertzienne [CPMOH]

DEGERT, Jérôme
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Applied Physics Letters. 2005, vol. vol. 87, n° 24, p. 244103 (3 p.)

American Institute of Physics

Résumé en anglais

The complex optical index refraction of an iron (II) spin-crossover coordination polymer is measured in the Terahertz frequency range by Terahertz time-domain spectroscopy (THz-TDS). By scanning the temperature from 288 to 333 K, we have recorded the evolution of the THz spectrum within the low spin - high spin thermal hysteresis loop. We were able to simultaneously infer the refractive index and absorption variations. The low spin-high spin transition has a marked spectral signature in the millimeter wavelength. In the 0.1–0.6 THz frequency range, the variation of real and imaginary part of the index of refraction is 6% and 20%, respectively. A marked absorption is observed above 500 GHz. The THz-TDS provides a clear direct fingerprint of this class of materials, which are interestingly potential candidates for optical data storage and processing devices< Réduire

Mots clés en anglais

Optical constants

Polyemers and organics

Time-resolved optical spectroscopies

Optical measurements

Condensed matter

Hysteresis

Magnetic phase boundaries

Spin crossover

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Dielectric characterization of [Fe(NH2–trz)3]Br2H2O thermal spin crossover compound by terahertz time domain spectroscopy

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