Bragg Mirror Light Source for Dark-Field Microscopy

The patent extracts the dark-field illumination function from the complex traditional optical system (objectives, condensers) and implements it through a simplified substrate-based approach. The substrate incorporates a photonic crystal layer that generates high-angle scattered light directly at the sample plane, eliminating the need for specialized dark-field optical components while maintaining reliable biological specimen analysis capability

The patent introduces a photonic crystal layer as an intermediary between the light source and the sample. This photonic crystal structure acts as a mediator that transforms conventional light into high-angle scattered light, enabling dark-field illumination without requiring complex optical pathways or specialized microscopy components

The patent creates a functional copy of the dark-field illumination effect using a photonic crystal substrate rather than replicating the entire traditional dark-field optical system. The photonic crystal layer reproduces the high-angle light scattering function that produces dark-field contrast, but in a miniaturized form factor that can be integrated into standard microscope slides or substrates

The patent changes the physical parameters of light interaction by using a photonic crystal structure with specific lattice constants and refractive index contrasts. This structure modifies the light propagation characteristics to generate high-angle scattered light, achieving dark-field illumination conditions without the bulky optical components traditionally required