Elliposometer, sample positioning mechanism, and polarization angular adjusting mechanism, used in the elliposometer
First Claim
1. An ellipsometer for detecting polarization of light successively reflected from a reference sample and an objective sample to study a surface state of the objective sample, the ellipsometer, which has a first optical path and a second optical path, comprising:
- a first sample holder unit for holding a first sample;
a second sample holder unit for holding a second sample;
a beam projecting portion for projecting a beam of plane-polarized light toward the first sample;
a polarizer for allowing light having a specific plane of polarization to transmit therethrough;
a turn-around prism for turning around the light beam reflected from the first sample in parallel at a distance to direct it to the second sample;
an analyzer for allowing light having a specific plane of polarization to transmit therethrough;
a light detector for detecting light transmitted through the analyzer; and
a sample positioning mechanism for arranging the first and second samples at appropriate positions and in appropriate orientations, the first optical path extending from the beam projecting portion to the turn-around prism by way of the first sample, the second optical path extending from the turn-around prism to the light detector by way of the second sample, the first and second optical paths extending in parallel at an interval between them and communicated with each other through the turn-around prism;
the polarizer located on the first optical path between the beam projecting portion and the first sample, the analyzer located on the second optical path between the second sample and the light detector, the polarizer allowing plane-polarized light having a plane of polarization inclined at an angler of +45°
with respect to a plane of incidence of the first sample to transmit therethrough, the polarizer and analyzer satisfying crossed Nicols;
one of the first and second samples being the objective sample, the other of the first and second samples being the reference sample to be compared to the objective sample in polarization analysis, accordingly, one of the first and second sample holder units being an objective sample holder unit, the other one of the first and second sample holder units being a reference sample holder unit; and
the sample positioning mechanism including the objective sample holder unit, the objective sample holder unit holding the objective sample so as to adjust height and inclination thereof, and the sample positioning mechanism comprising an objective sample height/inclination adjusting section for adjusting the height and inclination of the objective sample.
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Accused Products
Abstract
An ellipsometer, which detects polarization of light successively reflected from a reference sample and an objective sample to study the objective sample, comprises first and second sample holder units for holding first and second samples, a beam projecting portion for projecting a beam of plane-polarized light toward the first sample, a polarizer, a turn-around prism for turning around the light beam reflected from the first sample to direct it to the second sample, an analyzer, a light detector for detecting light transmitted through the analyzer, and a sample positioning mechanism for arranging the first and second samples at appropriate positions and in appropriate orientations. The sample positioning mechanism includes one of the first and second sample holder units, which holds the objective sample, and comprises a height/inclination adjusting section for adjusting height and inclination of the objective sample.
63 Citations
24 Claims
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1. An ellipsometer for detecting polarization of light successively reflected from a reference sample and an objective sample to study a surface state of the objective sample, the ellipsometer, which has a first optical path and a second optical path, comprising:
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a first sample holder unit for holding a first sample;
a second sample holder unit for holding a second sample;
a beam projecting portion for projecting a beam of plane-polarized light toward the first sample;
a polarizer for allowing light having a specific plane of polarization to transmit therethrough;
a turn-around prism for turning around the light beam reflected from the first sample in parallel at a distance to direct it to the second sample;
an analyzer for allowing light having a specific plane of polarization to transmit therethrough;
a light detector for detecting light transmitted through the analyzer; and
a sample positioning mechanism for arranging the first and second samples at appropriate positions and in appropriate orientations, the first optical path extending from the beam projecting portion to the turn-around prism by way of the first sample, the second optical path extending from the turn-around prism to the light detector by way of the second sample, the first and second optical paths extending in parallel at an interval between them and communicated with each other through the turn-around prism;
the polarizer located on the first optical path between the beam projecting portion and the first sample, the analyzer located on the second optical path between the second sample and the light detector, the polarizer allowing plane-polarized light having a plane of polarization inclined at an angler of +45°
with respect to a plane of incidence of the first sample to transmit therethrough, the polarizer and analyzer satisfying crossed Nicols;
one of the first and second samples being the objective sample, the other of the first and second samples being the reference sample to be compared to the objective sample in polarization analysis, accordingly, one of the first and second sample holder units being an objective sample holder unit, the other one of the first and second sample holder units being a reference sample holder unit; and
the sample positioning mechanism including the objective sample holder unit, the objective sample holder unit holding the objective sample so as to adjust height and inclination thereof, and the sample positioning mechanism comprising an objective sample height/inclination adjusting section for adjusting the height and inclination of the objective sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An ellipsometer for detecting polarization of light successively reflected from a reference sample and an objective sample to study a surface state of the objective sample, the ellipsometer, which has a first optical path and a second optical path, comprising:
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a first sample holder unit for holding a first sample;
a second sample holder unit for holding a second sample;
a beam projecting portion for projecting a beam of plane-polarized light toward the first sample;
a polarizer for allowing light having a specific plane of polarization to transmit therethrough;
a turn-around prism for turning around a light beam reflected from the first sample to direct it to the second sample in parallel to the incident light beam at a distance therefrom;
an analyzer for allowing light having a specific plane of polarization to transmit therethrough;
a light detector for detecting light transmitted through the analyzer; and
a polarization angular adjusting mechanism, arranged between the beam projecting portion and the polarizer, for adjusting angular direction of the polarization of plane-polarized light about an optical axis projected from the beam projecting portion, the first optical path extending from the beam projecting portion to the turn-around prism by way of the first sample, the second optical path extending from the turn-around prism to the light detector by way of the second sample, the first and second optical paths extending in parallel at an interval between them and communicated with each other through the turn-around prism;
the polarizer located on the first optical path between the beam projecting portion and the first sample, the analyzer located on the second optical path between the second sample and the light detector, the polarizer allowing plane-polarized light having a plane of polarization inclined at an angler of +45°
with respect to a plane of incidence of the first sample to transmit therethrough, the polarizer and analyzer satisfying crossed Nicols;
one of the first and second samples being the objective sample, the other of the first and second samples being the reference sample to be compared to the objective sample in polarization analysis, accordingly, one of the first and second sample holder units being an objective sample holder unit, the other one of the first and second sample holder units being a reference sample holder unit; and
the polarization angular adjusting mechanism comprising a plane-polarization rotatory element for rotating the polarization of incident plane-polarized light about the optical axis, and a mount for rotatably supporting the plane-polarization rotatory element about the optical axis. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification