Abstract:
A lithographic apparatus includes an illumination system configured to condition a radiation beam; a polarization sensor configured at least in part to couple to a reticle stage, wherein components of the reticle polarization sensor can be loaded and unloaded in the lithographic apparatus in the manner used for conventional reticles. In one configuration an active reticle tool includes a rotatable retaxder configured to vary the retardation applied to polarized light received from a field point in the illumination system. In another configuration, a passive reticle tool is configured as an array of polarization sensor modules, where the amount of retardation applied to received light by fixed retarders varies according to position of the polarization sensor module. Accordingly, a plurality of retardation conditions for light received at a given field point can be measured, wherein a complete determination of a polarization state of the light at the given field point can be determined. In another configuration, the polarization sensor is configured to measure the effect of a projection lens on a polarization state of light passing through the projection lens. ® KIPO & WIPO 2008
Abstract:
A lithographic apparatus includes an illumination system configured to condition a radiation beam; a polarization sensor configured at least in part to couple to a reticle stage, wherein components of the reticle polarization sensor can be loaded and unloaded in the lithographic apparatus in the manner used for conventional reticles. In one configuration an active reticle tool (40) includes a rotatable retarder (R) configured to vary the retardation applied to polarized light received from a field point in the illumination system. In another configuration, a passive reticle tool is configured as an array of polarization sensor modules, where the amount of retardation applied to received light by fixed retarders varies according to position of the polarization sensor module. Accordingly, a plurality of retardation conditions for light received at a given field point can be measured, wherein a complete determination of a polarization state of the light at the given field point can be determined. In another configuration, the polarization sensor is configured to measure the effect of a projection lens on a polarization state of light passing through the projection lens.
Abstract:
The present invention relates to an apparatus and a method for detecting an amount of depolarization of a linearly polarized beam transmitted by a birefringent medium in the direction of the optical axis thereof. The apparatus comprises a first beam splitter (7) for separating an on-axis portion (2) of said linearly polarized beam into the orthogonal components (3,4), two photodetectors (8,9) for detecting each component (3,4), a second beam splitter (12) for separating an off-axis portion (11) of said linearly polarized beam into the orthogonal components (15,16), wherein said second beam splitter (12) is disposed off-axis of the incident linearly polarized beam (1), a second set of photodetectors for detecting the components (15,16) separated by said second beam splitter (12), and a subtracting device (17) for substracting the signals received by said second set of photodetectors (13,14) from the respective signals received by the first two photodetectors (8,9).
Abstract:
An ellipsometry system and method using spectral imaging are provided. The ellipsometry system includes a light source group for projecting a white light collimated to a multi-point region defined on the surface of a sample, a light analysis group for polarizing a reflected white light to analyze it, and a spectral imaging group for dispersing and imaging the polarized white light. The white light collimated to the multi-point region is input to the spectral imaging group and dispersed by a light dispersing means by wavelengths such that the dispersed lights are imaged on one axis of an imaging plane by the points forming the multi-point region and imaged on the other axis of the imaging plane by wavelengths, to obtain optical data having information about the physical property of the points and wavelengths. Accordingly, a large amount of data can be obtained by wavelengths and points to improve rapidity and reliability of measurement.
Abstract:
본 발명은 이동물체 계측에 대응할 수 있는 고속의 표면 형상 계측을 실현하는 편광 방위 검출형 2차원 수광 타이밍 검출 장치 및 그것을 이용한 표면 형상 계측 장치에 관한 것이다. 도 8에 있어서 슬릿 광의 주사와 동기하여 검출광의 편광 방위를 회전시켜 그 편광 방위를 직교 니콜 배치의 2조의 검광자(5)(6)와 축적형 화상 검출기(7)(8)에 2차원적으로 기록하는 것으로, 슬릿 광이 축적형 화상 검출기(7)(8)의 각 화소에 입사하는 타이밍을 겨우 1회의 촬상에 의해 결정할 수 있도록 했다. [대표도]도8
Abstract:
PURPOSE: An ellipsometer for a fixed incidence surface is provided to reduce measuring time and remove experimental error in a calibration process by preventing a surface direction of a sample from moving and to measure information of reflectance in addition to two variables measured by a general ellipsometer by comparing reflection of a standard sample and a measuring sample. CONSTITUTION: An ellipsometer comprises a light source(100), a polarized light generator(102), a support frame(104) of a sample, a polarized light analyzer(106) and a detector(108). The polarized light generator is rotated by a motor driving apparatus(110). Light from the light source has a specific polarized condition by passing through the polarized light generator. The polarized condition of light is changed again by being reflected on the sample. The polarized light analyzer passes polarized light in a specific direction. Luminosity of light is changed into an electric signal by the detector. The electric signal is evaluated by an A/D converter(112) and a wave form is analyzed by a computer. Consequently, a calibration process is removed and experimental error is removed.
Abstract:
본 발명의 편광 검출기는, 서로 평행하게 배치된 2개의 대향하는 면을 갖는 기판, 회절소자, 상기 기판의 한 면에 형성된 제1회절 격자 및 상기 기판의 다른 면에 형성된 제2회절 격자를 포함하고, 광이 상기 제1회절 격자 상에 입사되며, 상기 제1 및 제2회절 격자를 각각의 격자 간격이 상기 입사광의 파장과 거의 같은 편광 회절 소자, 상기 제1회절 격자의 광 입사측 상에 형성된, 상기 편광회절 소자에 대해 상기 입사광의 입사 영역을 제한하기 위한 제한 부재, 상기 제1 및 제2회절 격자들을 투과하는 광과 상기 제1 및 제2회절 격자들에 의해 회절된 광을 서로 다른 빔 스폿으로 각각 집광시키기 위한 집광 렌즈 및 상기 집광 렌즈에 의해 집광된 2개의 빔 스폿들 각각의 광 세기를 검출하기 위한 한쌍의 광 검출기 등을 포함한다.