Table 1 Enhancement of penetration depth for different virtual waveguides.

From: Reply to: The overwhelming role of ballistic photons in ultrasonically guided light through tissue

Waveguide size

Core radius = 0.888 mm (matching our paper1)

Core radius = 0.1 mm (reported by Edrei and Scarcelli4)

Waveguide type

GRIN

Step-index

Step-index (g = 0.9)

Step-index (g = 0.85)

Enhancement

154%

103%

30%

20%

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