Patent ID: 11862442
Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A plasma process monitoring device, comprising:
an optical probe;
a selection area light transmitter disposed to face a viewport formed in a chamber and comprising a plurality of selective light blockers for selectively blocking plasma light emitted through the viewport; and
a monitor for receiving plasma light transmitted through the optical probe and at least one of the selective light blockers to acquire information on the plasma light and monitoring uniformity of plasma generated in the chamber based on the information on the plasma light,
wherein the plasma light emitted through the viewport is divided by the selective light blockers and the plasma light is alternately blocked or transmitted so that intensity or quantity of plasma light for each area in the chamber can be measured,
wherein the selection area light transmitter is disposed between the viewport and the optical probe and includes a first side facing a side of the viewport and a second side facing the optical probe,
wherein the optical probe, the selection area light transmitter and the viewport are arranged along a first direction,
wherein the plurality of selective light blockers are arranged on a same plane along a second direction perpendicular to the first direction, and
wherein a size of the first side of the selection area light transmitter is equal to or larger than a size of the side of the viewport,
wherein each of the plurality of selective light blockers is formed of an LCD panel unit so that the selection area light transmitter includes a plurality of LCD panel units arranged along the second direction, each of the plurality of LCD panel units is powered individually, and the plasma light is transmitted only through an LCD panel unit of the plurality of LCD panel units to which power is supplied,
wherein the plasma process monitoring device further comprises:
a switch connected to the plurality of LCD panel units for selectively supplying power to the plurality of LCD panel units, and
a concave lens disposed between the selection area light transmitter and the optical probe for extending a range of an incidence angle of the plasma light emitted from the inside of the chamber and providing the extended range to the monitor,
wherein the selection area light transmitter is in a rectangular shape extending in the second direction and in a third direction perpendicular to each of the first direction and the second direction,
wherein the selection area light transmitter is configured to have an upper area, a central area and a lower area, each of the upper area, the central area and the lower area extending in the second direction,
wherein the plurality of LCD panel units are disposed only along the central area extending in the second direction among the upper area, the central area and the lower area so that only a central area of the chamber is monitored by the monitor,
wherein the number of the plurality of LCD panel units is 4 or more, and
wherein the switch is configured to control the plurality of LCD panel units so that the plasma light from the chamber is alternately transmitted through odd-numbered LCD panel units and even-numbered LCD panel units among the plurality of LCD panel units disposed only along the central area extending in the second direction.