Patent ID: 11879819
Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
Field: Measurement (Instruments)
Classification: CPC G  B  F | IPC B  F  G

Claim 13:
14. The method of claim 13, wherein the etching further comprises:
applying a mask to the device layer of the first wafer and the device layer of the second wafer and etching the device layer of the first wafer and the device layer of the second wafer around the mask, wherein the portion of each device layer under the mask forms a collection probe;
etching through the handle layer, BOX layer, and device layer of the first wafer to form a first part of a primary channel; and
etching through the handle layer, BOX layer, and device layer of the second wafer to form a second part of the primary channel;
wherein the handle layer of the first wafer and the handle layer of the second wafer each comprises a first surface and a second surface, each second surface being affixed to each corresponding BOX layer;
wherein an opening forming the first part of the primary channel at the first surface of the handle layer of the first wafer comprises a larger diameter than an opening forming the second part of the primary channel at the first surface of the handle layer of the second wafer.