Nanowire Multispectral Sensor Filters for Compact Spectral Imaging

The patent transitions from traditional bulk optical filters to nanoscale wire structures, utilizing the nanodimension to achieve spectral filtering. The nanowires have diameters on the order of tens to hundreds of nanometers, allowing spectral selectivity at a fundamental scale rather than through macroscopic optical components, thereby dramatically reducing device size while maintaining spectral resolution

The patent employs varying geometric parameters of the nanowires (diameter, length, spacing, and arrangement patterns) to tune the spectral response. By changing these parameters, different spectral bands can be selected without requiring different physical filter materials or bulky optical components, enabling compact multispectral imaging through parameter optimization rather than structural complexity

The nanowire structures function as passive optical filters that operate without requiring external power input. The spectral filtering is achieved through the inherent optical properties and geometric configuration of the nanowires themselves, rather than through active components like electro-optic modulators or programmable filters that would consume power. This self-service approach enables multispectral detection with minimal energy consumption

The patent replaces active mechanical or electronic filtering systems with passive nanoscale optical structures. Instead of using movable filters, liquid crystals, or electronically controlled components, the spectral selection is achieved through the fixed geometric arrangement and dimensions of the nanowires, which are manufactured once and remain static during operation, eliminating continuous power requirements

The patent divides the optical filtering function into discrete nanowire elements that can be independently controlled. Each nanowire or group of nanowires can be designed with specific geometric properties to target particular spectral bands. This segmentation allows for modular design and fabrication, where standard semiconductor manufacturing processes can be used to create arrays of identical or varied nanowires through lithographic patterning, reducing the overall precision burden compared to monolithic filter designs

The patent uses variations in nanowire geometric parameters (diameter, length, spacing, orientation) as the primary means of achieving spectral selectivity. These parameters can be controlled through standard semiconductor fabrication techniques such as lithography and etching, where dimensional control at the nanoscale is routinely achieved. By encoding spectral information in geometric parameters rather than requiring complex multi-layer structures or precise alignment of multiple components, the manufacturing precision requirements are managed through established industrial processes