Abstract
We perform long-time measurements of the optical silica transmittance during several months in different environments and with different nanofiber lengths. These measurements are repeatable and give guidelines to control and to improve the lifetime and the performances of the nanofiber. The dust particles on the nanofiber surface is the fundamental reason behind its degradation. Enhancing the cleanness conditions of the nanofiber environment makes its lifetime increases significantly (from some hours to some months) and enables to avoid the dramatic decrease of its transmittance even after months. The nanofiber length does not contribute to the nanofiber transmittance degradation. Stabilizing the nanofiber transmittance after its decrease is possible by putting in in a dust free box.
Highlights
The optical nanofiber is created by stretching a standard silica fiber until its diameter becomes typically comparable to the light wavelength
We tested two different environments of the nanofibers : the partially protective glass holder directly held in the normal lab cleanliness conditions (Environment1) and the same holder overprotected in a dust free box (Environment2)
In environment1, T1 goes from 0.76 to 0.715 (-5x10-4/day) but T2 is only reduced from 0.745 to 0.74 (-5x10-5/day). This slighter slope degradation illustrates the impact of the additional protection offered by the dust free box
Summary
The optical nanofiber is created by stretching a standard silica fiber until its diameter becomes typically comparable to the light wavelength. Thanks to its small diameter, this component has a strong confinement of light inside the silica enabling the generation of nonlinear effects such as the generation of supercontinuum [1] It has an intense evanescent field exploited for optical sensing [2], optical traps for quantum applications [3] and the excitation of non linearities when immersed in liquids [4,5,6]. Despite all these attractive applications, the nanofiber performances are limited by the degradation of its transmittance during time and by its short lifetime. We present the results and we discuss them giving some guidelines to preserve the nanofiber transmittance stability and to extend its lifetime
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