PCTac: Mechanochromic Photonic-Crystal Tactile Sensor for Dexterous Manipulation
Overview
This paper introduces PCTac, an open-source mechanochromic photonic-crystal fingertip sensor that converts local stress into a spatially resolved structural-color field. The authors demonstrate a repeatable relationship between applied normal load and observed hue response, integrating this representation directly into a Diffusion Policy. Evaluated across 90 physical rollouts on three real-robot manipulation tasks, PCTac Hue achieves 68 successes (75.6%), outperforming PCTac RGB (60 successes), Wedge RGB (57 successes), and vision-only approaches (29 successes). The sensor shows particular promise in perturbed test-tube insertion, achieving 16/30 successes compared to 13/30 for tactile RGB baselines and 1/30 for vision-only.
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Reported quantity · physical rollouts: 90 other · reported trials
“pen-source mechanochromic PC fingertip that uses a dense hue field as its tactile observation. Loading characterization demonstrates a repeatable relationship between the applied normal load and the observed hue response. We further integrate this representation directly into a Diffusion Policy and evaluate it on three real-robot manipulation tasks. Across 90 physical rollouts, PCTac Hue achieves 68 successes (75.6\%”
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- arXiv Robotics — research abstractsSignalPCTac: Mechanochromic Photonic-Crystal Tactile Sensor for Dexterous Manipulation
This paper introduces PCTac, an open-source mechanochromic photonic-crystal fingertip sensor that converts local stress into a spatially resolved structural-color field. The authors demonstrate a repeatable relationship between applied normal load and observed hue response, integrating this representation directly into a Diffusion Policy. Evaluated across 90 physical rollouts on three real-robot manipulation tasks, PCTac Hue achieves 68 successes (75.6%), outperforming PCTac RGB (60 successes), Wedge RGB (57 successes), and vision-only approaches (29 successes). The sensor shows particular promise in perturbed test-tube insertion, achieving 16/30 successes compared to 13/30 for tactile RGB baselines and 1/30 for vision-only.
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