Reflectionless window, method for manufacturing same, and reflectionless window for invasive sensor

A reflectionless window for a sensor, comprising:

• an optical fiber comprising a first end surface and a second end surface;
• a transparent window provided on the first end surface of the optical fiber;
• a plurality of first nanocolumns arranged on a surface of the transparent window and another surface which is opposite to the surface of the transparent window;
• a plurality of second nanocolumns having a height and a width smaller than a height and a width of the first nanocolumns, the plurality of second nanocolumns being arranged directly on an upper surface and a side surface of the plurality of first nanocolumns and being arranged in an area on a surface of the transparent window in which the plurality of first nanocolumns are not arranged, and
• a light source and a detector provided on the second end surface of the optical fiber,
• wherein the height and the width of the first nanocolumns corresponds to a first wavelength of light and the height and the width of the second nanocolumns corresponds to a second wavelength of light,
• wherein the second wavelength is shorter than the first wavelength, and
• wherein the plurality of second nanocolumns arranged on the side surface protrude in a direction lateral to the side surface.

A reflectionless window for an invasive sensor, comprising:

• a transparent window;
• a microstructure which is arranged on an upper part of the transparent window and has a shape of a needle to penetrate a skin layer;
• a plurality of first nanocolumns arranged on an end of the microstructure and lower part of the transparent window which is contacted with a light source;
• and
• a plurality of second nanocolumns having a height and a width smaller than a height and a width of the first nanocolumns, the plurality of second nanocolumns being arranged directly on an upper surface and a side surface of the first nanocolumn and an area where the first nanocolumns are not arranged among ends of the microstructure,
• wherein the height and the width of the first nanocolumns corresponds to a first wavelength of light and the height and the width of the second nanocolumns corresponds to a second wavelength of light,
• wherein the second wavelength is shorter than the first wavelength, and
• wherein the plurality of second nanocolumns arranged on the side surface protrude in a direction lateral to the side surface.