Spectroscopic sensing using a visible arrayed-waveguide grating

Yuki Komai; Hiroko Nagano; Katsunari Okamoto; Kashiko Kodate

doi:10.1117/12.616089

18 August 2005 Spectroscopic sensing using a visible arrayed-waveguide grating

Yuki Komai, Hiroko Nagano, Katsunari Okamoto, Kashiko Kodate

Proceedings Volume 5867, Optical Modeling and Performance Predictions II; 58670D (2005) https://doi.org/10.1117/12.616089
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

We have proposed a new application of an AWG for a compact planar spectroscopic sensor to meet both conditions for miniaturization and high-wavelength resolution in the sub-nanometer order. A liquid sample under test is poured into a groove (optical path length, 70μm: groove depth, 110μm) in the first slab region of the AWG. A preliminary experiment was carried out using water solution of sodium acetate with the fabricated near-infrared AWG sensor. Concentration of the sodium acetate solute could be determined with the average accuracy of ±0.25 wt%. As the next step of AWG-based sensor, we designed and fabricated a compact spectroscopic sensor using an AWG with an insertion loss of 4dB in the visible wavelength. For improving the sensitivity of visible AWG spectroscopic sensor, the optimal design of a groove for the liquid sample was carried out in consideration of the refractive index and transmittance of the chlorophyll a and b as various environmental indicators. We succeeded in discriminating chlorophyll solutions using the AWG sensor. And we obtained a transmittance difference of 1.4dB which is two times higher than that in the conventional scheme (0.7dB) by absorbency change of 1.0 (optical path: 1.0mm). From these theoretical and experimental investigations using a visible AWG, a compact AWG-based spectroscopic sensor has been confirmed to be effective in acquiring body information in bio-medical fields.

Citation Download Citation

Yuki Komai, Hiroko Nagano, Katsunari Okamoto, and Kashiko Kodate "Spectroscopic sensing using a visible arrayed-waveguide grating", Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 58670D (18 August 2005); https://doi.org/10.1117/12.616089

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