Nanoscale thermometry

A nanoscale temperature detector comprising

• - a diamond sensing probe with a sensing tip having a curvature radius (R) of less than 100 nanometres, or less than 10 nanometres, or less than 1 nanometre, and a plurality of colour centres, whose emission count rate show temperature-sensitive features,
• o wherein the diamond sensing probe is configured to optically guide a light emitted by the colour centres,
• o wherein the diamond sensing probe has a transverse dimension of at least 200 nanometres, the nanoscale temperature detector further comprising
• - a mounting structure connectable to a detector system, and
• - a thermal isolation barrier thermally decoupling the sensing probe from said detector system.