This system integrates skin analysis into a phone, using a liquid-crystal polarization modulator that switches polarization states in milliseconds to capture polarized images in 0.1 seconds. The app corrects any image misalignment, applies color-space conversion to enhance microvessels and pigment spots, and automatically marks acne, fine lines, and pores—calculating their counts and area. With just a smartphone and this clip-on case, users gain professional-grade, deep-layer skin insights.

The key component is the electrotunable polarization rotator published in Optica, boasting sub-0.1 s switching, and achromatic polarization. Embedded in a phone-case, it captures multi-polarization facial images with a single tap. The companion app automatically applies geometric calibration and color-space conversion to highlight microvascular networks and pigment spots, while marking and quantifying acne, fine lines, and pores. This portable solution delivers high-precision detection.

This system provides deep-layer detection technology to pure-software providers via API/SDK licensing, while enabling skincare brands and beauty studios to rapidly adopt through a hardware rental plus subscription model. The dual revenue approach blends licensing fees with recurring rental and subscription income, and leverages data monetization and aftermarket support to build a sustainable growth ecosystem.