Abstract: A millimeter-wave (mmW) imaging system comprises a mmW source configured to transmit mmW radiation to a target and a mmW imaging device. The mmW imaging device comprises an array of up-converter elements configured to convert backscatter radiation received from the target directly to visible light. The up-converter array has a first surface and a second surface. The mmW imaging device also comprises a first focusing lens optically coupled to the first surface of the up-converter array and configured to direct backscatter radiation received from the target to the up-converter elements. The mmW imaging device further comprises an an array of photodetectors. The photodetector array has a first surface and a second surface. The first surface of the photodetector array is configured to receive visible light emitted by the up-converter elements. The photodetector array is configured to produce electrical signals indicative of an optical image of the target.

Abstract: Embodiments described herein include a chipless patterned conductor, comprising one or more glyphs. Each glyph comprises a disk and a ring structure including at least one ring surrounding the disk. One or more of a spacing between the disk and the at least one ring and a width of the at least one ring is configured to determine a characteristic resonant frequency of the glyph. At least one notch is disposed in at least one of the disk and at least one ring of the ring structure. The at least one notch is configured such that the magnitude of resonances in the glyph are dependent on polarization direction.

Abstract: A millimeter-wave (mmW) imaging system comprises a mmW source configured to transmit mmW radiation to a target and a mmW imaging device. The mmW imaging device comprises an array of up-converter elements configured to convert backscatter radiation received from the target directly to visible light. The up-converter array has a first surface and a second surface. The mmW imaging device also comprises a first focusing lens optically coupled to the first surface of the up-converter array and configured to direct backscatter radiation received from the target to the up-converter elements. The mmW imaging device further comprises an an array of photodetectors. The photodetector array has a first surface and a second surface. The first surface of the photodetector array is configured to receive visible light emitted by the up-converter elements. The photodetector array is configured to produce electrical signals indicative of an optical image of the target.

Abstract: A millimeter-wave (mmW) imaging device comprises a mmW radar sensor, an auxiliary sensor arrangement, and at least one processor. The mmW radar sensor comprises a transmitter coupled to an antenna arrangement configured to transmit mmW radiation at a target, and a receiver coupled to the antenna arrangement or a separate antenna arrangement configured to receive backscatter radiation from the target. The auxiliary sensor arrangement is configured to detect one or both of relative motion and relative position between the imaging device and the target. A processor of the mmW imaging device is configured to receive data respectively produced by the mmW radar sensor and the auxiliary sensor arrangement during relative movement between the imaging device and the target. The processor or a remote processor is configured to reconstruct a mmW radar image of the target using the received data.

Abstract: Embodiments described herein include a chipless patterned conductor, comprising one or more glyphs. Each glyph comprises a disk and a ring structure including at least one ring surrounding the disk. One or more of a spacing between the disk and the at least one ring and a width of the at least one ring is configured to determine a characteristic resonant frequency of the glyph. At least one notch is disposed in at least one of the disk and at least one ring of the ring structure. The at least one notch is configured such that the magnitude of resonances in the glyph are dependent on polarization direction.