Two types of tunable polarization-independent two-dimensional grating guided-mode resonance (GMR) filters are proposed and analyzed. The GMR filters are based on 2D crossed sinusoidal diffraction grating to archive polarizationindependent reflectance spectra and can be fabricated by using low-cost nanoimprinting process. The first GMR filter structure is consisted of three layers, including a planar waveguide, a low refractive index separation layer, and a nanoimprinting grating layer and the other has only two layers. The diffraction efficiencies are investigated by rigorous coupled-wave analysis (RCWA) method. For these two filters, by altering the incident and azimuth angle, the resonance wavelength of the proposed GMR filter is tunable and polarization-independent, and TE- and TM-polarized incident light can have the same diffraction efficiencies by adjusting the azimuth angle. For the first GMR structure with a grating period of 416 nm, the simulation results show that when the incident angle varying from 15° to 19° and the azimuth angle is set at 34°, the tunability in resonance wavelength is at a slope of 3.8 nm/degree. At the incident angle of 17° and azimuthal angle of 34°, the lowest difference of the diffraction efficiencies between two polarizations is approximately 0.23% at the resonance wavelength of 686.3 nm. The average diffraction efficiencies are 45.33% (TE polarization) and 44.94% (TM polarization). For the second GMR structure with a grating period of 555 nm, the simulation results show that when the incident angle varying from the same 15° to 19° and the azimuth angle is set at 38°, the tunability in resonance wavelength is at a slope of 6.5 nm/degree.
We have numerically and experimentally demonstrated the enhancement of phase detection sensitivity of a grating-coupled surface plasmon resonance (GCSPR) sensor by using incident light at a nonzero azimuth angle. Phase detection measurements were performed using an electro-optic heterodyne interferometer. When the GCSPR sensor was rotated azimuthally by 0 deg and 58 deg, the phase detection sensitivities were approximately 3.2×10−7 RIU and 5.5×10−8 RIU, respectively. The azimuth angle of 58 deg was found to enhance the sensor sensitivity by a factor of 5.87 relative to the azimuth angle of 0 deg.
This study numerically and experimentally demonstrates the enhancement of phase detection sensitivity of a gratingcoupled surface plasmon resonance (GCSPR) sensor by using incident light at a nonzero azimuth angle. Phase detection measurements were performed using an electro-optic heterodyne interferometer. The experimental results show that when the GCSPR sensor was rotated azimuthally by 0° and 58°, the phase detection sensitivities were approximately 3.2x10-7 RIU and 5.5x10-8 RIU, respectively. The nonzero azimuth angle was found to enhance the sensor sensitivity by a factor of 5.87 relative to the zero azimuth angle
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.