Dielectric Anisotropy of Human Bone and CERABONE? in the Terahertz Spectral Range 0.2 to 2.5 THz

25th Annual International Laser Physics Workshop

Nikoghosyan, A.S.^1 ; Ting, H.^2 ; Shen, J.^2 ; Martirosyan, R.M.^1 ; Kazaryan, M.A.^4 ; Tunyan, M.Yu.^3 ; Papikyan, A.V.^3 ; Papikyan, A.A.^3

Yerevan State University, 1 Alex Manoogian, Yerevan

0025, Armenia^1

Capital Normal University, Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing

100048, China^2

Yerevan State Medical University, Yerevan, Armenia^3

Optics, Lebedev Physical Institute, Moscow, Russia^4

关键词: Cerabone;    Dielectric anisotropies;    Human bones;    Terahertz range;    Terahertz time domain spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/826/1/012005/pdf
DOI  :  10.1088/1742-6596/826/1/012005

来源: IOP

【 摘 要 】

Terahertz time-domain spectroscopy (THz-TDS) was applied to study properties of a human jawbone in transmission geometry. The fiber femtosecond laser (Fx-100, IMRA) with a pulse width of 113 fs, a central wavelength of 800 nm and an average power of 120 mW was used as a laser source for pumping and detecting terahertz pulses. The refractive indices n(ω) and absorption coefficients α(ω) of the human jawbone and bone substitute Cerabone® were determined in vitro by the THz-TDS in a wide frequency range from 0.2 to 2.5 THz. It is shown that the refractive index of the human jawbone changes between the values of 2.24 and 2.36, and Cerabone® between 2.4 and 2.65. The absorption coefficient of the human jawbone depending on frequency increases from 1.7 cm-1to 178.5 cm-1, showing several resonance absorption lines after 1.6 THz. The absorption coefficient of Cerabone® increases from zero to 80 cm-1, and the resonance absorption occurs at 1.7 THz. The experimental results indicate that n(f) and α(f) of a human jawbone change with the alteration of the direction of the linear polarization vector of the electric field of THz pulse relative to the axis of the plate of the human jawbone. The obtained results allowed us to determine the proximity of the physical properties of the Cerabone® with the natural bone matrix.