New scalable, etching-based technique for precise tuning of microdisk lasers

Micro- and nanodisk lasers have recently emerged as promising optical sources and probes for various applications in the fields of nanophotonics and biomedicine. Their ability to achieve lasing at a deterministic wavelength and ultra-narrowband precision is critical for several applications in on-chip photonic communications, on-chip bioimaging, biochemical sensing, and quantum photonic information processing. However, the large-scale fabrication of such precise wavelength micro- and nanodisk lasers remains challenging. Current nanofabrication processes introduce randomness in the disk diameter, making it difficult to achieve deterministic wavelengths in laser batches.