Abstract: A radio frequency identification (RFID) tag can include a die attached to an inductive-capacitive (LC) circuit including a capacitive element coupled to an inductive element. The LC circuit can have a resonant frequency that varies according to properties of fluid proximate the RFID tag. The RFID tag can further include a coating material disposed around the die to form an outer surface of the RFID tag. The coating material may have a thickness over a portion of the LC circuit, to permit a conductivity property of a fluid proximate the outer surface to affect the resonant frequency of the LC circuit such that the resonant frequency shifts to a second resonant frequency. Additional apparatus, systems, and methods are disclosed.

Abstract: A radio frequency identification (RFID) tag can include a die attached to an inductive-capacitive (LC) circuit including a capacitive element coupled to an inductive element. The LC circuit can have a resonant frequency that varies according to properties of fluid proximate the RFID tag. The RFID tag can further include a coating material disposed around the die to form an outer surface of the RFID tag. The coating material may have a thickness over a portion of the LC circuit, to permit a conductivity property of a fluid proximate the outer surface to affect the resonant frequency of the LC circuit such that the resonant frequency shifts to a second resonant frequency. Additional apparatus, systems, and methods are disclosed.

Abstract: A polarizer including a substrate sheet configured with grid elements on at least a first surface, wherein the grid elements have a height to width aspect ratio of at least 1.5:1, and metal coupled with the grid elements, wherein the metal comprises a height to width aspect ratio greater than the aspect ratio of the grid elements of the substrate.

Abstract: The presently disclosed subject matter provides functional perfluoropolyether (PFPE) materials for use in fabricating and utilizing microscale devices, such as a microfluidic device. The functional PFPE materials can be used to adhere layers of PFPE materials to one another or to other substrates to form a microscale device. Further, the presently disclosed subject matter provides a method for functionalizing the interior surface of a microfluidic channel and/or a microtiter well. Also the presently disclosed subject matter provides a method for fabricating a microscale structure through the use of a sacrificial layer of a degradable material.