Biological sensing apparatus, biological sensing system, and method of using the same

A biological sensing system comprising:

• a broadband light source,
• an input optical fiber coupled to the broadband light source,
• a biological sensing apparatus coupled to the input optical fiber, and the biological sensing apparatus comprising:
• an optical waveguide comprising:
• a light input end, and
• a light output end opposite to the light input end,
• wherein, a biological sensing area is formed on one surface of the optical waveguide between the light input end and the light output end,
• a surface plasmon resonance (SPR) layer comprising:
• a metal layer arranged on part of the biological sensing area, and
• a plurality of biological probes evenly arranged on the metal layer, and
• a lossy mode resonance (LMR) layer arranged on part of the biological sensing area, and the LMR layer and the SPR layer being not overlapped,
• an output optical fiber coupled to the light output end, and
• a spectrometer coupled to the output optical fiber,
• wherein, the plurality of biological probes is formed on the metal layer through self-assembly after the metal layer is surface modified,
• wherein, an incident light emitted by the broadband light source is configured to enter the optical waveguide through the input optical fiber for LMR in the biological sensing area;
• wherein the optical waveguide is a planar optical waveguide;
• wherein the SPR layer and the LMR layer are side by side with each other and the metal layer of the SPR layer and the LMR layer are substantially coplanar with each other such that an object under test is simultaneously in contact with the SPR layer and the LMR layer, and the spectrometer receives an SPR signal of the SPR layer and an LMR signal of the LMR layer simultaneously through the output optical fiber;
• wherein a resonance wavelength shift of a biological signal is calculated from a resonance wavelength shift of the SPR signal and a resonance wavelength shift of environmental interference signal.

A method of using a biological sensing system, comprising steps of:

• arranging an object on a biological sensing area comprising a surface plasmon resonance (SPR) layer and a lossy modal resonance (LMR) layer side by side and not overlapped, and the object configured to simultaneously contact with the SPR layer and the LMR layer,
• emitting, by a broadband light source, an incident light to input to the biological sensing area, the incident light configured to generate an SPR signal on the SPR layer, and simultaneously the incident light configured to generate an LMR signal on the LMR layer, and
• receiving, by a spectrometer, the SPR signal and the LMR signal simultaneously, and subtracting the LMR signal from the SPR signal to obtain a biological signal,
• wherein, the SPR layer comprises:
• a metal layer, and
• a plurality of biological probes is formed on the metal layer through self-assembly after the metal layer is surface modified;
• wherein the optical waveguide is a planar optical waveguide;
• wherein the metal layer of the SPR layer and the LMR layer are substantially coplanar with each other such that an object under test is simultaneously in contact with the SPR layer and the LMR layer, and the spectrometer receives the SPR signal of the SPR layer and the LMR signal of the LMR layer simultaneously through the output optical fiber;
• wherein a resonance wavelength shift of the biological signal is calculated from a resonance wavelength shift of the SPR signal and a resonance wavelength shift of environmental interference signals.