Fiber-optic temperature and flow sensor system and methods

A process for fabricating a fiber optic sensor, comprising:

• forming at least one silicon pillar on a silicon substrate;
• forming a thin film adhesive on a glass substrate;
• pressing an end face of an optical fiber onto the thin film adhesive and releasing;
• placing the thin film adhesive on the end face onto the at least one silicon pillar;
• and
• curing the thin film adhesive to form the fiber optic sensor.

A fiber optic sensor, comprising:

• an optical fiber configured to be coupled to a light source and a spectrometer;
• and
• a first silicon layer disposed on an end face of the optical fiber, where the first silicon layer defines a Fabry-Pérot interferometer and a sensor head, where the sensor head reflects light from the light source to the spectrometer,
• wherein the first silicon layer includes a double sided-polished silicon pillar with a diameter less than approximately 100 μm.

A fiber optic sensor, comprising:

• an optical fiber configured to be coupled to a light source and a spectrometer;
• a first silicon layer disposed on an end face of the optical fiber, where the first silicon layer defines a Fabry-Pérot interferometer and a sensor head, where the sensor head reflects light from the light source to the spectrometer;
• and
• a second silicon layer disposed on the first silicon layer, where a first silicon layer length is different from a second silicon layer length.