Broadband ATR-sensor with variable path lengths

Karl-Friedrich Klein; Subash Pandey; Pasma Dahal; Moritz Klein; Mathias Belz; Georg Hillrichs

doi:10.1117/12.909059

16 February 2012 Broadband ATR-sensor with variable path lengths

Karl-Friedrich Klein, Subash Pandey, Pasma Dahal, Moritz Klein, Mathias Belz, Georg Hillrichs

Proceedings Volume 8218, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII; 82180T (2012) https://doi.org/10.1117/12.909059
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

A spectral Attenuated Total Reflection (ATR-) sensor with variable path lengths is proposed. Based on a new polymer cladding material, the numerical aperture and the related maximum propagation angle in Polymer Clad Silica Fiber (PCSF) have been increased significantly. The penetration depth of the evanescent field into the cladding of step-index fibers depends strongly on the propagation angle. We found that when removing its cladding, the effective path length in the interaction section can be adjusted, using meridional rays/modes of different propagation angles. Because the fiber length is short, the mode conversion in the light-transporting section of the PCSF is negligible. After measuring the optical properties of the PCSF, the ATR with selected liquids surrounding the light-guiding core is determined in dependence of wavelength and excitation-angle. Especially, the possibilities to change from low to high propagation angles including the excitation and detection system will be discussed.

Citation Download Citation

Karl-Friedrich Klein, Subash Pandey, Pasma Dahal, Moritz Klein, Mathias Belz, and Georg Hillrichs "Broadband ATR-sensor with variable path lengths", Proc. SPIE 8218, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII, 82180T (16 February 2012); https://doi.org/10.1117/12.909059

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