US Patent No. 10,690,595

OPTICAL SENSING DEVICE, METHOD OF MANUFACTURING THE SAME, AND OPTICAL SENSING METHOD


Patent No. 10,690,595
Issue Date June 23, 2020
Title Optical Sensing Device, Method Of Manufacturing The Same, And Optical Sensing Method
Inventorship Chi Lok Wong, Singapore (SG)
Malini Olivo, Singapore (SG)
Assignee Agency for Science, Technology and Research, Singapore (SG)

Claim of US Patent No. 10,690,595

1. An optical sensing device based on surface plasmon resonance (SPR), the optical sensing device comprising:an optical arrangement configured to provide a p-polarization light beam and a s-polarization light beam;
a prism comprising a sensing surface at a base of the prism, the prism configured to receive the p-polarization light beam and the s-polarization light beam and reflect the p-polarization light beam and the s-polarization light beam at the sensing surface;
a polarizing beam splitter arranged to receive the reflected p-polarization light beam and the reflected s-polarization light beam from the prism and configured to separate the reflected p-polarization light beam and the reflected s-polarization light beam in a first direction and a second direction, respectively; and
a detector arrangement configured to detect the reflected p-polarization light beam and the reflected s-polarization light beam from the polarizing beam splitter;
wherein the optical arrangement comprises:
a light source configured for emitting a light beam comprising a p-polarization component and a s-polarization component; and
an initial beam splitter arranged between the light source and the prism, the initial beam splitter configured to receive the light beam from the light source and configured to separate the light beam into the p-polarization light beam and the s-polarization light beam;
wherein the light source is configured to be at a predetermined orientation for emitting the light beam comprising the p-polarization component and the s-polarization component, the predetermined orientation being 1° to less than 45° from an orientation of the light source which produces a light beam without the s-polarization component.