# Harnessing spin and orbital angular momentum light for optimal algae growth

## TL;DR

This study shows that light with specific angular momentum properties improves algae growth and protein synthesis, which could help in large-scale algae cultivation for carbon reduction.

## Contribution

The study reveals that light with orbital angular momentum enhances algal transmittance and protein synthesis compared to other light types.

## Key findings

- Right-handed light sources show higher transmittance in algal fluid than left-handed ones under specific conditions.
- Light with orbital angular momentum increases transmittance and accelerates Chlorella cell density growth.
- OAM light stimulates Chlorella to synthesize more proteins.

## Abstract

The present study investigated the difference in transmittance of light carrying opposite spin angular momentum (SAM) and orbital angular momentum (OAM) through chlorella algal fluid with varying concentrations and thicknesses. Our results indicate that, under specific conditions, right-handed light sources exhibit higher transmittance in the algal fluid compared to left-handed light sources. Furthermore, we observed that light with OAM also demonstrated higher transmittance than other types of light sources, leading to faster cell density growth of Chlorella. Interestingly, we also discovered that light with OAM stimulates Chlorella to synthesize more proteins. These findings provide different insights for selecting appropriate light sources for large-scale algae cultivation, and may facilitate the realization of carbon peaking and carbon neutrality in the future.