[INVITED] New perspectives in photonic crystal fibre sensors

• The advances on photonic crystal fibre sensors are analysed.
• Some innovative photonic crystal fibres are discussed.
• The trends, opportunities and challenges in photonic crystal fibre sensors are discussed.

In this paper we analyse the recent advances on sensors based on photonic crystal fibres(PCFs) and discuss their advantages and disadvantages. Some innovative approaches to overcome the main limitations of PCF sensors are also analysed. In addition, we discuss some opportunities and challenges in PCF sensing for the coming years.