OSA's Digital Library

Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 23 — Dec. 1, 2009
  • pp: 3722–3724

Accurate determination of optical coefficients from chemical samples using terahertz time-domain spectroscopy and effective medium theory

Edward P.J. Parrott, J. Axel Zeitler, and Lynn F. Gladden  »View Author Affiliations


Optics Letters, Vol. 34, Issue 23, pp. 3722-3724 (2009)
http://dx.doi.org/10.1364/OL.34.003722


View Full Text Article

Enhanced HTML    Acrobat PDF (222 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

A technique for calculating the optical constants of powdered materials that have been pressed into pellets along with a diluent such as polyethylene, as is commonly used in the spectroscopy community, is introduced. The simple Beer–Lambert law typically used to calculate the optical constants has the inherent weakness that it treats the absorbing medium as a single nonporous solid, as opposed to a dielectric material embedded within a medium. This leads to a systematic underestimation of both the absorption coefficient and the refractive index, especially at low filling factors. Effective medium theory provides a way to calculate more accurate optical constants and produces similar optical constants across a wide range of filling factors, including crucially at the low filling factors commonly used experimentally. The technique can also be extended to estimate the porosity of the samples and provide a true, preparation-independent value for the optical properties of the sample material.

© 2009 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(160.4760) Materials : Optical properties
(300.1030) Spectroscopy : Absorption
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Materials

History
Original Manuscript: September 1, 2009
Manuscript Accepted: October 2, 2009
Published: November 25, 2009

Citation
Edward P. Parrott, J. Axel Zeitler, and Lynn F. Gladden, "Accurate determination of optical coefficients from chemical samples using terahertz time-domain spectroscopy and effective medium theory," Opt. Lett. 34, 3722-3724 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-23-3722


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. J. A. Zeitler, P. F. Taday, D. A. Newnham, M. Pepper, K. C. Gordon, and T. Rades, J. Pharm. Pharmacol. 59, 209 (2007). [CrossRef] [PubMed]
  2. E. P. J. Parrott, J. A. Zeitler, T. Friščić, M. Pepper, W. Jones, G. M. Day, and L. F. Gladden, Cryst. Growth Des. 9, 1452 (2009). [CrossRef]
  3. B. M. Fischer, M. Walther, and P. U. Jepsen, Phys. Med. Biol. 47, 3807 (2002). [CrossRef] [PubMed]
  4. A. Markelz, A. Roitberg, and E. J. Heilweil, Chem. Phys. Lett. 320, 42 (2000). [CrossRef]
  5. T. D. Dorney, R. G. Baraniuk, and D. M. Mittleman, J. Opt. Soc. Am. A 18, 1562 (2001). [CrossRef]
  6. R. Wilk, I. Pupeza, R. Cernat, and M. Koch, IEEE J. Sel. Top. Quantum Electron. 14, 392 (2008). [CrossRef]
  7. E. P. J. Parrott, J. A. Zeitler, L. F. Gladden, S. N. Taraskin, and S. R. Elliott, J. Non-Cryst. Solids 355, 1824 (2009). [CrossRef]
  8. P. U. Jepsen and B. M. Fischer, Opt. Lett. 30, 29 (2005). [CrossRef] [PubMed]
  9. J. C. Maxwell-Garnett, Philos. Trans. R. Soc. London Ser. A 203, 385 (1904). [CrossRef]
  10. E. P. J. Parrott, J. A. Zeitler, J. McGregor, S.-P. Oei, H. E. Unalan, S.-C. Tan, W. I. Milne, J.-P. Tessonnier, R. Schlögl, and L. F. Gladden, J. Phys. Chem. C 113, 10554 (2009). [CrossRef]
  11. Y. C. Shen, P. F. Taday, and M. Pepper, Appl. Phys. Lett. 92, 051103 (2008). [CrossRef]
  12. M. Franz, B. M. Fischer, and M. Walther, Appl. Phys. Lett. 92, 021107 (2008). [CrossRef]
  13. J. A. Zeitler and L. F. Gladden, Eur. J. Pharm. Biopharm. 71, 2 (2009). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

Figures

Fig. 1 Fig. 2
 

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited