Infrared Spectrometer Using Polymer Bragg Mirrors

The patent changes the physical parameters of the optical path by using a bent waveguide structure instead of straight propagation, allowing the optical path to be folded within a compact footprint. This enables long propagation lengths needed for spectral analysis while maintaining a small device size. The waveguide parameters (bending radius, path length, confinement) are optimized to maintain low loss while achieving miniaturization.

The patent integrates multiple optical functions into a single integrated photonic circuit platform. The waveguide, spectral filter, and detector are nested within a single chip structure, eliminating the need for separate mirrors, beam splitters, and alignment mechanisms. This nesting approach reduces device complexity while preserving spectral analysis capability.

The patent employs silicon nitride waveguides and standard semiconductor fabrication techniques instead of expensive specialized infrared materials. Silicon nitride can be manufactured using CMOS-compatible processes, dramatically reducing manufacturing cost while providing sufficient optical performance for MIR and LWIR spectral ranges through proper waveguide design and coupling mechanisms.

The patent changes the operational parameters by using evanescent field coupling and plasmonic enhancement techniques to achieve strong light-matter interaction in thin-film structures. This allows standard materials to achieve the optical performance previously requiring expensive specialized materials, by optimizing waveguide dimensions, coupling gaps, and resonance conditions.

The patent transitions from one-dimensional linear optical paths to two-dimensional bent waveguide paths within a planar chip. The optical path is folded back and forth through multiple bends, achieving long propagation lengths (centimeters to meters equivalent) within a millimeter-scale chip footprint. This dimensional reconfiguration enables high spectral resolution without proportionally increasing device size.

The patent uses bent and curved waveguide sections instead of straight paths. The waveguide follows a serpentine or spiral trajectory, utilizing curvature to pack long optical paths into compact spaces. The bending radius is carefully controlled to minimize propagation loss while maximizing the effective path length within the available chip area, thereby achieving high wavelength resolution in a small device.