Dear Colleagues,

The development of photonic sensors has gained enough momentum in recent years such that they are now ubiquitously found. Their strength lies in optical methods being inherently fast and mostly non-invasive, so analytical investigations in diverse fields can be performed quickly, contact-free, and thus nondestructively. Yet, more sophisticated approaches are necessary to meet the increasing demand for such sensors in an ever-increasing number of fields of application.

The aim of this Special Issue is to bring together researchers working on all aspects of photonic sensor technology and to showcase new developments, especially in the context of harsh environments. These environments can be defined such that they can impede the operation of a sensor or may be one for which the sensor was not intended to be used. Harshness thereby originates from different sources, such as high (low) pressure, high (low) temperature, mechanical stress, radiation, chemicals, humidity, as well as biological (including inside body).

This Special Issue therefore intends to collect both reviews and original research papers on novel photonic sensor technology in harsh environments. Potential topics will include but are not limited to the following:

• Novel designs and schemes
• Novel sources
• New materials
• First-principle calculations
• Signal processing and analysis

Dr. Georgios Ctistis
Guest Editor

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