Guided-mode resonance (GMR) filters have attracted lots of attention due to their potential applications in filters, semiconductor lasers, modulators and bio-sensors. GMR filters are composed of few dielectric layers and gratings. Compared to the traditional multilayer filters, they are easily fabricated and extremely suitable for the free-space filter as well as the application for the coupling of light from free space to waveguide mode. However, the deviation between the refractive indices of the guiding waveguide and grating is very small because the refractive indices of the polymers are in the range of 1.40 to 1.69, which lagged the design of the polymer GMR filter with a high performance. Here, we proposed novel methods to design polymer GMR reflection filters with single-layer channel for microfluidic application. The side-bands (side-lobe) of the filter are minimized. We also demonstrate the spectrum responses of a tunable microfluidic optical filter with different fluids introduced into the micro-channels based on multilayer polymers. These methods would pave a road to the tunable microfluidic GMR filters.
We propose and experimentally demonstrate an optofluidic refractive index sensor based on surface plasmon resonance with a figure of merit (FOM) reaching 20 in fluids at oblique incidence. The device consisting of a dielectric nano-grating sandwiched between double-layer gold stripes. A finite difference time domain (FDTD) method is employed to understand the optical properties and determine appropriate device parameters. The double-layered metal nano-grating (DLMNG) is fabricated by combining two beam interference lithography and electron beam evaporation deposition. A refractive index sensitivity of more than 560 nm/RIU is obtained using an optimized structure. The simple optical configuration of the DLMNG with high refractive index sensitivity make it possible for optofluidic sensors to be a promising candidate as a functional optical component in label-free biomedical sensing and integrated microfluidic chips.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.