Photonic crystal sensors with integrated fluid containment structure
View Patent ↗Photonic crystal (PC) sensors, and sensor arrays and sensing systems incorporating PC sensors are described which have integrated fluid containment and/or fluid handling structures. Sensors and sensing systems of the present disclosure are capable of high throughput sensing of analytes in fluid samples, bulk refractive index detection, and label-free detection of a range of molecules, including biomolecules and therapeutic candidates. The present disclosure also provides a commercially attractive fabrication platform for making photonic crystal sensors and systems wherein an integrated fluid containment structure and a photonic crystal structure are fabricated in a single molding or imprinting processing step amendable to high throughput processing.
1. A method of making a photonic crystal sensor having an integrated fluid containment structure, said method comprising the steps of:
providing a master template having an external surface with a pattern comprising a photonic crystal periodic surface grating structure and structure for forming a fluid containment structure, the periodic surface grating structure located within the structure forming the fluid containment structure;
transferring the pattern of said master template to a material such that the material forms a fluid containment structure having a cavity with the photonic crystal periodic surface grating structure positioned within the cavity; and
depositing a thin dielectric film on the photonic crystal periodic surface grating structure to thereby forming a photonic crystal sensor.
2. The method of claim 1 , wherein the cavity comprises a sample well.
3. The method of claim 1 , wherein the cavity comprises a fluid flow channel.
4. The method of claim 1 , wherein said step of transferring is carried out via replica molding.
5. The method of claim 1 wherein said step of transferring is carried out via imprint lithography.
6. The method of claim 1 wherein said material comprises a curable fluid material, and wherein said step of transferring comprises the steps of:
contacting said external surface of said master template with the curable fluid material, wherein said curable fluid material conforms to the shape of the external surface of the master template;
curing said curable fluid material while in contact with the external surface of the master template; and
separating the cured fluid material from the master template.
7. The method of claim 1 , wherein the external surface of the master template is configured to form a plurality of sample wells, at least one port, and fluid channels connecting the port to the sample wells, and wherein the external surface is patterned to form a photonic crystal periodic surface grating in at least one of 1) each of the fluid channels, and 2) each of the sample wells.