Sensitive hydrogen sensor based on selectively infiltrated photonic crystal fiber with Pt-loaded WO_3 coating

A review for optical sensors based on photonic crystal cavities

“…We can predict that the application ranges of PCC sensor can be greatly extended by combining optical coating with PCC to realize the functional PCC [121]. Besides, the technology of optical coating can also improve the sensitivity and selectivity of optical sensors based on the functional PCC with optical coating.…”

“…In recent years, the deposition of optical coating with nanometric thickness has been shown to significantly enhance the sensitivity and selectivity of a number of optical sensing systems to A c c e p t e d M a n u s c r i p t certain external parameters, such as refractive index [119], pH [120], gas concentration [121], temperature [24], biochemical molecule [27], and humidity [122]. We can predict that the application ranges of PCC sensor can be greatly extended by combining optical coating with PCC to realize the functional PCC [121].…”

[INVITED] New perspectives in photonic crystal fibre sensors

“…The holey structure of PCFs offers an additional degree of freedom in the design of optical sensors as they can be infiltrated with liquids, gases or nanomaterials [16][17][18][19][20][21][22][23]. In most cases the PCF plays also the role of gas or liquid chamber.…”

“…This gives rise to a strong light-matter interaction, hence to high sensitivity. The complexity of the setups to infiltrate gases, liquids or nanoscale materials in the PCFs [16][17][18][19][20][21][22][23] is an issue that must be minimised otherwise it will be difficult to find practical applications of PCFs for gas or liquid sensing. On this regard, PCF sensors can benefit from the advances in micro-and opto-fluidics and nanotechnology.…”

Ultra-sensitive temperature sensor based on liquid crystal infiltrated photonic crystal fibers

“…Due to its pure silica and air holes structure, PCF-based temperature sensors [1][2] have extremely low thermal dependence, and a compensation process can be avoided. However, high thermal dependence can be realized with the recently attracted technique of selectively fluid-filled PCF [3][4][5][6][7][8]. There are a number of techniques for achieving selective filling, including collapsing air-holes, injection-cleave techniques exploiting the differential filling speeds of holes of different sizes [9], focused ion beam milled microchannels [10], femtosecond laser-assisted technique [11], and direct manual-gluing [12].…”