Hello researchers!

While studying the literature on refractive index sensors, most of the articles simulate their devices with a refractive index ranging from 1 to 1.1, with small steps in between. My question is, how these values can be realized practically? Is there a list of materials with such refractive index values? Or, can you indicate any literature that has covered such an issue? Or, is there any reason that most of the articles are choosing this range?

Thanks in advance.

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