Chromation's spectral sensor is enabled by a patented photonic crystal technology. Incident light enters a waveguide and is scattered by the photonic crystal to a detector array based on its wavelength, which allows for spectral decomposition in a smaller volume than previously possible. The sensor works over a wide range of wavelengths, UV-VIS-NIR, which traditionally require a bulky and expensive spectrometer. The photonic crystal technology makes the sensor small and inexpensive, appropriate for handheld and wearable tools with measurement capabilities typically found in bench-top laboratory instruments.
Our photonic crystals are 2D arrays of features etched into fused silica. We use projection lithography to make many photonic crystal dies from a single wafer. This is a high-throughput, inexpensive process. Our materials and process are fully compatible with silicon fabrication lines, providing economy of scale.
Chromation’s spectral sensor addresses a diverse range of applications where spectral information (e.g. color) is indicative of state. The sensor is ideally suited to applications where information is needed across either a broad spectral range or multiple smaller bands. The continuous UV-VIS-NIR range is unmatched by competing products, enabling systems that otherwise require bulky and expensive spectrometers.
A growing number of applications have been demonstrated using our systems including:
- Color matching to a palette (design/manufacturing)
- Anti-counterfeiting marker detection (security)
- Colorimetric indicator readout on interfering colored backgrounds (safety/health and wellness)
- Chemical activity via fluorescent indicator dynamics (safety/health and wellness)
- Tristimulus parameter measurement (lighting analysis/design)
- Melanopic ratio calculation (lighting analysis/health and wellness)
- Film thickness measurement (manufacturing/industrial)
- Low-cost photonic crystals for spectral sensors fabricated using projection lithography
- Inexpensive photonic crystal spectrometer for colorimetric sensing applications
- A high-resolution spectrometer based on a compact planar two dimensional photonic crystal cavity array
- Photonic crystal spectrometer