Optical lithography or 3D printing operates on multi-dimensional movement at high resolution. Therefore, accurate position of both x-axis and y-axis deserves real-time measurement. Herein, we utilizes a half-external cavity orthogonal self-mixing laser interferometry for determining displacement of two independent targets. Synchronous detection of irrelevant displacements with nanometer accuracy (<10 nm) is realized here. Circularly polarized laser beam is optically-multiplexed into two polarization states for two additional external cavity. The laser system only needs a single-channel optical intensity to reflect the perpendicular displacement without reference path, which is conducive to simplify the acquisition channel and collimation.
Carbon nanotube, the smallest nanoelectronic materials, has been extensively used as electric materials for chip-scale electronics due to their high electronics conductivity, desirable mechanical properties, and easy surface functionalization. Also the conductive polymer, well-known for its high work function, real-time responsiveness, easy film-formation ability and stretchability. Herein, we combine the carbon nanotube-doped hydrophilic materials with conductive polymer via two-photon hydrogelation for conductivity-tunable functional devices. Taking advantage non-covalent π-π effect, we interpenetrated π-conjugated poly (3,4-ethylenedioxythiophene) into multiwall carbon nanotube-embedded mesoscopic hydrogels, which sustains electronic conductivity, hydrogel-like mechanical properties and desirable tolerance to humid/acid environments. Some reliable, nanostructured, metal-free electronic circuits and interdigital capacitors were fabricated and identified. Carbon nanotube-doped electric hydrogels successfully breaks current limitations by making better use of two photon hydrogelation and intermolecular force with conductive polymer. Moreover, a fast-speed two-photon fluorescence imaging technique using same optical system was deployed to detect the distribution of conductive polymer around electric patterns. Keywords: multi-wall carbon nanotube, conductive polymer, two-photon hydrogelation, mesoscopic electric hydrogels.
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