Device and method for measuring optical properties

A method for measuring optical properties, comprising the steps of:

• irradiating an exciting light to a site of a sample to be measured;
• irradiating a probe light having a flux on the site to be measured or in a vicinity thereof such that the probe light enters a light position detector;
• and
• measuring the optical properties of the sample from the degree of deflection of the probe light by forming the flux of the probe light with an intensity distribution such that a gravitational center of light intensity distribution at the site of the sample to be measured is close to the sample.

A device for measuring optical properties, comprising:

• a liquid tank for containing a liquid;
• means for spreading a thin film on a surface of the liquid;
• an exciting light source for emitting exciting light to be irradiated on a site of the thin film to be measured;
• an optical intensity modulator for modulating intensity of the exciting light before reaching said measuring site;
• a probe light source for emitting probe light to be irradiated on the measuring site at an incident angle so as to be totally reflected at the liquid surface;
• a light position detector for detecting the degree of deflection of the probe light passed through said measuring site;
• and
• intensity distribution modifying means for bringing a gravitational center of light intensity distribution of the probe light close to the sample when the probe light omitted from said probe light source approaches the site to be measured.

A method for measuring optical properties, comprising the steps of:

• irradiating excited light onto a site of a sample to be measured
• irradiating probe light on the site to be measured or in the vicinity thereof such that the probe light enters a light position detector, wherein the probe light comprises at least two beams;
• measuring the optical properties of the sample from the degree of deflection of the probe light;
• setting an optical system so as to make the vector sum of fluctuation of the respective beams from a standard point on a detecting surface caused by fluctuation of the sample invariably zero;
• and
• modifying an intensity distribution of the probe light so as to bring the gravitational center of the probe light to the site of the sample to be measured.

A device for measuring optical properties, comprising;

• a liquid tank for containing a liquid
• means for spreading a thin film on a surface of the liquid;
• an exciting light source for emitting exciting light to irradiate a site of the thin film to be measured at an incident angle so as to be totally reflected at the liquid surface;
• optical means for permitting the exciting light totally reflected at the liquid surface to be incident again onto the site to be measured at an angle so as to be totally reflected at the liquid surface;
• an optical intensity modulator for modulating the intensity of the exciting light before reaching the site to be measured;
• a probe light source for emitting probe light to pass through the site to be measured or in the vicinity thereof;
• a light position detector for detecting the degree of the deflection of the probe light passed through the site to be measured or in the vicinity thereof;
• and
• an intensity distribution modifying means for bringing a gravitational center of light intensity distribution of said probe light close to the sample when the probe light emitted from the probe light source reaches the site to be measured.