Critical-point phonons of diamond

Claude A. Klein; Thomas M. Hartnett; Clifford J. Robinson

doi:10.1117/12.48285

1 December 1991 Critical-point phonons of diamond

Claude A. Klein, Thomas M. Hartnett, Clifford J. Robinson

Proceedings Volume 1534, Diamond Optics IV; (1991) https://doi.org/10.1117/12.48285
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

The phono-dispersion curves derived from neutron-scattering experiments performed on diamond are not accurate enough to yield the exact frequencies of critical-point (CP) phonons and, thus, to provide a satisfactory interpretation of second-order optical spectra. A self- consistent analysis of such spectra proved to be difficult because it is not a straightforward task to assign second-order absorption and scatter features to specific two-phonon summations. A more effective method for obtaining accurate CP-phonon frequencies involves investigating defect-activated one-phonon absorptions; in this paper, the authors take advantage of the availability of chemically vapor-deposited (CVD) diamond for the purpose of locating and assigning infrared (IR) absorption features in the one-phonon region to CP phonons at the Brillouin-zone boundary. Fourier-transform IR absorbance spectra of CVD diamond exhibit a complex structure at wavenumbers below the 1333-cm^-1 band-mode cutoff, which is induced by nitrogen-associated defect centers and yields the precise positions of sixteen zone-edge CP phonons. In conjunction with the triply-degenerate zone-center mode, this set of phonons then provides the basis for predicting the positions of second-order optical features through simple summations. Taking the selection rules into account, the procedure yields excellent results, not only in terms of CVD-diamond IR spectra, but also in regard to earlier measurements of the intrinsic two-phonon absorption coefficient of type-IIa natural diamond and the second-order polarization-dependent Raman-scatter characteristics recorded by Solin and Ramdas.

Citation Download Citation

Claude A. Klein, Thomas M. Hartnett, and Clifford J. Robinson "Critical-point phonons of diamond", Proc. SPIE 1534, Diamond Optics IV, (1 December 1991); https://doi.org/10.1117/12.48285

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